There are 2 Sonny Thompson. One is a R&B composer
who is credited in my library (correct) in some blues albums:
the same Sonny Thompson is credited (wrong) in these albums by Michel Portal (last one by Prince):
in this case, he should be another Sonny T. (bass player):
finally, in my library there is a second Sonny T.:
with no additional infos. he could be the bass player. in any case, he is not credited in all the correct albums.
note that in allmusic there is quite a mess:
there are 2 sonny loyd thompson (or loyd sonny thompson) who are the same person (bass player) and 2 sonny thompson, none of them credited where they should (Prince, Portal, etc)