Under normal circumstances, if a combo continues to ply its trade after all the original members have, in one way or another, moved on, I'd consider that to be a tribute act. A notable exception to the rule is Gong, an outfit who, with its various offshoots and side-projects, is as much a continuum of musical ideas as a band (interestingly, another exception to the rule is fellow Canterbury Scene alumni Soft Machine). Instigated, nurtured and encouraged by Daevid Allen from 1967 until his death in 2015 (in spite of his own periods of absence from the core line-up), Gong continue to tour and release new music to this day, their latest LP being last year's quite wonderful 'The Universe Also Collapses'. The record features knowing nods to the past, but also keeps a keen eye on the future and I can warmly recommend it to all former, or current, Pot Headed Pixies.
Gong - Forever Reoccurring