Main Instrument Played by Benny in ABBA
Puzzle 17 of Smelly Things Easy Pack
Question is: Main Instrument Played by Benny in ABBA
and the answer is: KEYBOARD
Word Meaning:
KEYBOARD — (computing, computer hardware) A set of keys laid out in a gridlike pattern, used for typing on a typewriter, computer, etc.
Definitions from Wiktionary.