More than one song book (7)
I believe the answer is:
numbers
This clue is a double definition.
'more than one song' is the first definition.
(I've seen this before)
'book' is the second definition.
(I've seen this before)
(Other definitions for numbers that I've seen before include "Fourth book of the Bible" , "anaesthetists?" , "Integers" , "OT Book 4" , "Amounts; counts" .)