sentence: taking time off from pink floyd 's schedule , gilmour also took up various roles as a producer , sideman and even concert sound engineer for a wide variety of acts which included former bandmate syd barrett , paul mccartney , kate bush , berlin , john martyn , grace jones , tom jones , elton john , eric clapton , b . b . king , seal , sam brown , jools holland , bob dylan , pete townshend , the who , supertramp , levon helm , robbie robertson , alan parsons , peter cetera , and various charity groups among others .