MJ started w/Motown and moved to CBS.

Miles started w/i dunno...Prestige? then moved to Columbia. then to Warner Brothers.

>sade still with Sony for almost 30 years.

yeah.

>Madonna was with Warners for 20 plus years.

yeah but she doesn't count either b/c she left and is w/Live Nation now.

>Smokey Robinson with Motown for a long long long time

sure. but he did leave for SBK briefly, so he doesn't count.

i mean, all of these acts spent a long time w/one label and that's something. but i wonder specifically if there are more acts like Stevie who've spent a long career signed exclusively to one label for the duration. i can't think of any. you listed Sade - she's one.