Brian Wilson is someone else whose conservatorship got very messy:
Beach Boys member Brian Wilson once had a court-appointed conservator just like Britney Spears. Here's everything we know.www.cheatsheet.com
Similar situation with some mental health struggles.
Except that Brian Wilson was part of a band, not a solo act. And since he was the main songwriter for the band, the band depended on him for most of their songs (well, at least most of their good ones). There's similarities but IMHO there's more differences than similarities.
FWIW although Brian isn't currently under a conservatorship, there's rumours that his current wife pushes him to tour and to make records, even though he's not really up to it mentally and finds it really stressful, because she wants the big $$$ to keep rolling in.