I've seen people try suggesting headphones to be created (
http://forum.blockland.us/index.php?topic=74169.0 http://forum.blockland.us/index.php?topic=37310.0 http://forum.blockland.us/index.php?topic=109286.0).
My idea is but different. Similar to the third link but different.
Basically, yes, it's an item that when you activate it you wear fancy looking headphones. You should also be able, probably per a GUI, to select the music/song that's available on the server so you can listen to it via your fancy looking headphones everywhere you go, without disturbing someone or not to be able to place a music brick since it's in range of another one.
Now now, before you go all "START MEDIA PLAYER AND PLAY SONG" here's the flip to the trick; Instead of playing the original thing in it's usual normal (High Quality probably..) quality it should be able to somehow change the quality of the song, remov- actually
THIS(original) and
THIS(low quality) will explain it.
Get it? With the headphones, every song that you're going to listen to will play in a hilarious old radio-like quality (aka the radio in portal?)
It would be awesome in my opinion but I don't see how it's possible to change the quality of a song ingame without remaking the whole song.