These songs are really good. The only problem is they're three to four minutes long. Now, I might sound like a bit of a hypocrite because I have a song in my server that's about 2 1/4 minutes long, but music should usually be no longer than a minute. A minute and a half is pushing it.
Basically what I'm suggesting is that you search through the songs for nicely-looping parts that last anywhere from about 15 seconds to around a minute. You should be able to figure out how to loop them correctly as there are more than enough music tutorials in this forum that's SUPPOSED to be just a music release forum... but I'm getting off topic.
Finally, please give credit to the people you got these from in your first post. People might come in and think you made them (which I admit I did at first until I read the whole of the topic). Sorry for ranting on you, I just don't like it when people post full-length songs when there's a topic clearly saying not to. Very nice sounding songs, though.