Here's 45 songs from nano, which includes 34 covers, 6 original songs, and 5 more tracks from various collaboration albums. Also, the second cover, Cantarella, is missing, but oh well.
Since 40 of the songs have been ripped off of niconico and youtube, the audio quality isn't perfect, with an average bitrate of 262kbps. But if you're a fan of nano, check them out anyways, since most of these will probably never be released in higher quality.