The Chicago guitarist Pete Cosey, who died last Wednesday at 68, was far from a celebrity. Jazz fans know him for his distinctive work with Miles Davis in the 70s, but beyond that his name is unlikely to ring too many bells. Odds are that you’ve heard at least a little of his work, though, whether you know it or not. As a studio musician at Chess Records he played on some huge R&B hits, including “Rescue Me” by Fontella Bass and “Summertime” by Billy Stewart. In fact, he probably played on hundreds of great records for Chess during the 60s, but because he was a musician for hire, part of the house band, his name rarely appears in recording credits.