I use focus a lot. Especially to see what musicians an artist has recorded with. Its highly valuable. But I have not found a way to use focus (or other ways) to show me defined group of musicians or an artists solo albums.
Let me give an example: If I go to Paul Bley’s discography, I can use focus to se all the musicians he has recorded with. Eg. he has recorded 40 albums with Gary Peacock. And 30 albums with Paul Motian. Also I can se, that 15 of these albums they have recorded together (fantastic albums btw!). Many other musicians appeared on (some of) these albums, but I can not see what albums are trio albums, i.e Bley, Peacock & Motian? As well as I can not filter to see Paul Bleys’s solo albums? Unless I’m missing something? Unless I filter all musicians he has recorded out, but that would be a big task.