Here's a Tom Petty story:
Tom and the rest of Mudcruntch left Florida, heading for Los Angeles to get a record deal. The Dwight Twilley Band (Dwight and his partners, Phil Seymour on drums and vocals, and guitarist Bill Pitcock IV) already had their first album out on Shelter, and it had made quite an impact amongst 50's and 60's Rock 'n' Roll aficionados (that album---Sincerely---is one of the greatest debut albums of all time. It's an incredible blend of Memphis and Liverpool.).
Mudcruntch stopped in Tulsa Oklahoma to seek advice from TDTB, and perhaps get some L.A. contacts. Twilley introduced Petty to Leon Russell, who had a Shelter office in town. After arriving in L.A., Petty did his first recording at the Shelter recording studio on Sunset Blvd., and the renamed TP & THB debut came out on Shelter Records, seeing respectable sales. Petty ended up achieving far more success than did The Dwight Twilley Band.