Answer: pianostool

AnswerCrossword Clue
PIANOSTOOL

Keyboardist's support

PIANOSTOOL

It's sometimes below middle C

PIANOSTOOL

Supporter of Liberace?

PIANOSTOOL
Bench alternative
PIANOSTOOL
Keyboardist's perch
PIANOSTOOLProp for Liberace
PIANOSTOOLSerkin's support
PIANOSTOOLIt's usually below middle C?
PIANOSTOOLSupport for a certain player
PIANOSTOOLSeat for a ragtime player