This is actually a good idea. Took it from my thread about song timers. It will be buried in there so I'm putting this suggestion here.
Expanding on this now...
I'd like to see something for bard songs.
Items that would increase the duration of the song.
Items that would add +# damage or attack to the appropriate song.
Items that would add +# temporary hit points to the appropriate song.
Items that would add +# AC to the AC song.
A song to increase the effectiveness of buffs...say someone casts resist energy on you, you play a song that increases the resistance by 5.