In a recent interview posted on Ultimate guitar:
Joe Satriani was ready to abandon the music industry when Rolling Stones singer Mick Jagger hired him.
The guitar virtuoso was losing $8,000 a week on a failing tour in 1988 as he struggled to promote his album "Surfing With The Alien" – then Jagger added him to his touring band. The six-stringer has never looked back from there. http://www.ultimate-guitar.com/news/general_music_news/how_jagger_saved_satchs_career.html