Conversation so far:
Who was Yanni relative to Bradley Joseph?
In 1989, Bradley Joseph recorded his first demo tape and sent it off to Greek composer Yanni, who was looking for someone to replace keyboardist John Tesh.
Did Bradley Joseph request to work with Yanni?
In 1989, Bradley Joseph recorded his first demo tape and sent it off to Greek composer Yanni, who was looking for someone to replace keyboardist John Tesh.
Did Yanni like the Bradley Joseph's 1989 demo?
When Yanni heard Bradley Joseph's compositions and arrangements, he was hired over the phone to join his core band, without ever meeting.

Question: How long did he work with Yanni?
Self-contained rewrite: How long did Bradley Joseph work with Yanni?