sentences:  The band had the misfortune of existing in a time when heavy metal had yet to become commercially viable (though that would change significantly in the coming years) and personal differences caused the band to break up in 1978.Upon the breakup of Sister, bassist Nikki Sixx and guitarist Lizzie Grey formed the band London, a band that Lawless would soon join as well.London has become well known for having several members in its ranks during its three year existence who would go on to major success later in the 1980s, such as Sixx, Lawless, Izzy Stradlin, and Fred Coury.