Once a band achieves iconic status, the reasons (perceived or real) for disbanding multiply quickly (nowhere to go but down creatively, don't wanna sully the rep, egos begin conflicting, etc.). But, by example, Sonic Youth have withstood all that: integrity in tact (Starbucks flak notwithstanding), startlingly creative, still cooperative. And yet, Thurston regrets not having ended SY in 1990 (and ...