Another thing that comes to mind, although not related closely at all, is this, excerpted from
here:
A responsum of Rav Moshe Feinstein (Iggeros Moshe, E.H. 1:96) concerning the case of a composer of popular religious songs who became known as a sinner.[5] The question arose whether it was permissible to sing the songs he composed while he was still reputed to be a God-fearing, upstanding Jew, and, if so, whether it was permissible to also sing the songs composed after he was determined to act sinfully. Rav Moshe ruled that singing any of this musician’s songs is permissible, for several reasons.
[5] Rav Moshe writes that this musician “brings unmarried men and unmarried women together and plays before them.” Presumably, this responsum, which was written in 1959, refers to Shlomo Carlebach.