Not being a full time Bard(partial retired a few years back lvl 60) I found some things disturbing.

~Why does Corsair get 3 rolls and bards don't?

Possible solutions I can think of...

Re-categorize the types of bard song available and offer a single buff "3rd song" that ISN'T overwritten by normal AoE songs.
Even more specific, the stat song are completely underutilized and with a Scholar's Stormsurge pointless. Not to mention every bard song overwrites itself, so giving players a stat boost will overwrite itself next song sung.

This "3rd" song option would increase song use across the spectrum.