Here's a thought... Add a new song exclusive to Virtuoso Bards:

Étude I - Gain 2% XP Bonus for the duration of the song. (Virtuoso I)
Étude II - Gain 5% XP Bonus for the duration of the song. (Virtuoso II)
Étude II - Gain 12% XP Bonus for the duration of the song. (Virtuoso III)

XP Bonus % subject to change. Stacks with Voice, Mantle, and XP Tomes & Pots.

The song applies to all party members within a range, like other Bard songs.

Would people play the Virtuoso now?