What the forget is Vocaloid?
Vocaloid is a series of programs designed to create songs while sounding as realistic as possible. These aren't synthesizers per se, because the programs are created by using a real person's voice rather than pure manipulation of sound. For each voice used, they have an anime-esque style character to represent that voice. Most Vocaloids use Japanese voice banks, though a handful use other languages such as English and Spanish.
Is it any good?
Much like anything else, 90% of it all is
stuff unless you're a die-hard fan that will defend anything that is Vocaloid. However, each of the more popular characters have at least ten or more songs that they sing absolutely beautifully. All the 'loids that are kind of in the woodwork are lucky to have that many good songs. Remember, the quality of a Vocaloid's songs is dependent on how the creator of a song uses them, not the character itself. Any Vocaloid that doesn't catch a good composer's attention will likely be doomed to be mediocre.
Who are the popular ones?
First off, there have been three generations of Vocaloids so far, each generation marked with a huge change to the Vocaloid engine.
Vocaloid 1
Sakine Meiko/MEIKOMEIKO was the first attempt at a "lovey" character for vocaloid, and the voice shows. Sakine Meiko was later made to appeal to a younger audience, reducing the age of the character from around 20 to 15. MEIKO has a low, mature voice, while Sakine Meiko has a higher, brighter voice. The fanbase has decided MEIKO is a happy drunk who constantly beats up KAITO, while Sakine Meiko is constantly happy.
Notable Songs:
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Change Me - A love song that shows off just how amazing MEIKO can sound.
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Honey - A love song that shows off how adorable Sakine Meiko can sound. (A version with other 'loids performing can be found
here.)
KAITOThe first (popular) attempt at a male Vocaloid. KAITO has an awkward voice, though when used properly, he sounds pretty freakin' smoking. The fanbase gave him an awkward personality, a love for ice cream, and patience with MEIKO's constant beatings.
Notable Songs:
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Lord of Darkness - It doesn't get much different than this.
Vocaloid 2
Hatsune Miku:The most popular Vocaloid by far. A handful of people who have seen her around don't realize what she's from, however, so now you know. She has the highest voice out of the V2 'loids, and sounds her best while singing higher-pitched songs. She isn't the first 'loid out of V2, though she was the first developed by Crypton, thus the 01 on her shoulder. (Crypton dominated the popularity contest for V2.) The fanbase has dubbed her as an optimistic dreamer who aspires to become a diva.
Notable Songs:
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Rolling Girl - Miku flaunts her mastery of higher notes in this one.
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Melody Line - Miku + Autotune = Rather lovey.
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Romeo and Cinderella - A love song. Miku shows that she can rock those lower notes in this song.
The Kagamine Twins, Rin and Len:Rin and Len Kagamine were both voiced by the same woman, Rin being a young girl's voice and Len being a young boy's voice. It's up to debate whether or not they're different versions of each other from different dimensions, actual twins, or if one person had a love change (This is a plot point in one of their songs, in which Rin falls in love with Miku, and then turns into Len to win her over). The fanbase has decided Rin is somewhat haughty, while Len is the shy and quiet, yet kind, shota.
Notable Songs:
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Meltdown - Rin shows off solo.
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Dream-Eating Monochrome Baku - Len shows off solo with some jazzy Japanese mythology.
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Butterfly on your Right Shoulder - One of many duets between the twins. Rin and Len shine while side-by-side.
Megurine Luka:Luka boasts both a Japanese and English voice bank, coming on stage as the first bilingual Vocaloid. She has the softest voice out of V2, and the fanbase agrees she is the most beautiful-sounding 'loid from V2 when used to her full potential. There have been discussions about her personality for the longest time, though she's either portrayed as shy and sensitive or tsundere.
Notable Songs:
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Double Lariat - An absolutely beautiful song that shows Luka can have just as powerful of a voice as anyone else. The dance is fantastic, as well (I would have linked one with the dance, but the sound quality is lower in those).
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Just Be Friends - A break-up song with lyrics that come from the guy's point of view.
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Answer - A sequel to Just Be Friends, from Luka's POV.
Vocaloid 3
Gumi Megpoid:Originally from V2, Gumi has recently gotten a revamp with the release of V3. Even during V2, the fanbase concluded she sounds more realistic than any other Vocaloid when used to her full potential. Her voice is mostly
absolutely adorable, though she's managed to break that view of her in a handful of her songs. She's the genki girl of the franchise.
Notable Songs:
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Candy Candy - Gumi shows her adorableness.
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Killer Lady - She's adorable, but that doesn't mean she can't be lovey.
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Eye Examination - Gumi shows she can sound amazing even when she's not trying to be adorable.
IA:Another Vocaloid that rocks the high notes. She has a piercing voice, much like Miku, but is slightly more versatile. She sounds her best in frantic, energetic songs where her voice compliments synthesizers. The fanbase decided that she's an idealistic dreamer who just wants to make everyone happy.
Notable Songs:
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A Tale of Six Trillion Years and a Night - IA's voice works well with the synth- and drum-heavy frantic instrumentals.
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A Realistic Logical Ideologist - Once again, the energetic instrumentation really compliments IA's voice.
Yuzuki Yukari:A 'loid with a very soft, gentle voice much like Luka's. Out of V3, she is by far the most beautiful- and INCREDIBLY realistic-sounding when used at her best (Not quite as realistic as Gumi). It's been speculated that she might have been designed as Luka's and Gakupo's (an unlisted V2) daughter, given the hair color and qualities of her voice. The fanbase still hasn't decided on a personality for her, but there's a good chance she will be shy and quiet, much like one of Luka's possible personalities.
Notable Songs:
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Torinoko City - A cover of an existing song. Yukari really flaunts her mature-sounding voice here.
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Setsu-Getsu-Ka (Skip to 0:40 for the actual song) - The finished version of one of Yukari's demo songs. Yukari + Techno = Mind-blowing.
There's a stuff LOAD of others that I haven't listed, such as Gakupo, CUL, Lapis, and various others, but I don't want to make OP too long. And before you ask, I didn't list World is Mine under Miku's songs because that song gets old VERY fast.
Other notable songs and stuff
Here, have some duets:
-Furan Furan Zombie by Gumi and CUL
-World is Mine by Miku and KAITO (They actually work well together)
-Magnet by IA and Aoki Lapis (Originally performed by Miku and Luka, but these two do an AMAZING job. Really, this video deserves more views -- the poster made it themselves)
-Tsukema Tsukeru by IA and Oliver (Oliver sounds a small bit off because he's only programmed with and English voicebank)
Allow me to introduce you all to Circus Monster, a song from the POV of a Vocaloid that's being exploited for money. Just about every 'loid has sung this so far, but only a handful are actually good. It was originally sung in English by Luka, and every 'loid without an English voicebank sings it in Japanese. It's still hauntingly beautiful between languages.
The better versions of this song include Gumi's, Oliver's (English), Aoki Lapis's, and, by far the best version, CUL's.
Discussion, GO!