The Yoko Factor - S1.E7

Doc meets pretentious performance artist Siobahn, who clashes with Jace and the others. Doc dates Siobahn and irritates the band by bringing her to rehearsals, dressing more stylishly and redecorating his house. The band members finally revolt when Doc tries to make them integrate a sitar into their sound and allow Siobahn to sing. Doc is mad that Jace was allowed to bring in Sarah yet Siobahn is rejected. Jace fights with both Doc and Siobahn. Lucas becomes exasperated with the conflicts and quits, leaving the band without a drummer again.