As a base class it gets by quite well with Harmonic Strike for damage and Lullaby to stun. With defense not being a major issue early-game lyres are a very formidable 2 handed weapon.
Muse - Adds durability and versatility to the class
Jester - Adds offensive/maneuverability spells to the class
Minstrel - Adds buff/supportive spells to the class