LyricWiki, as it name implies, is a wiki for lyrics. It has a huge database of lyrics which can be freely edited. Thus, it would be a very nice feature to have such a good collaborative tool built in into Jaikoz. Furthermore, it's very easy to implement it, as the lyrics are enclosed in the <lyrics> html tags.
The website of LyricWiki is lyricwiki.org, and the registration is free.
Thanks for your attention.