I've developed a spreadsheet that will display the numerical values of songs based upon your level. It makes a nice cheat sheet when trying to figure out what songs to play in a given party/situation. It also displays known compatibility issues with other songs/spells, which I can never seem to keep track of :)
Rokenn has graciously posted it at his excellent Bard Song Analysis site(the source of all the formulas and tables):
http://rgonzalez.net/EQSongs
I hope you find it useful!
- Reed (E'ci)