Notes played by second band (6)
I believe the answer is:
stones
'band' is the definition.
(the Rolling Stones)
'notes played by second' is the wordplay.
'played' indicates anagramming the letters (letters playing around).
'by' is a charade indicator (letters next to each other).
'second' becomes 's' (common abbreviation).
'notes' with letters rearranged gives 'stone'.
'stone'+'s'='STONES'
(Other definitions for stones that I've seen before include "Rolling rock group" , "They've been rocking and rolling since the 1960s" , "Attacks" , "''Sticks and ...... may break my bones''" , "lots of rock" .)