Answer:

TUBA

Answer	Crossword Clue
TUBA	Big brass
TUBA	Big, band instrument
TUBA	Oom-pah-pah instrument

TUBA	Latin for "trumpet"
TUBA	Big band member?
TUBA	Big horn
TUBA	Oompah instrument
TUBA	Its oompah has oomph
TUBA	Hefty horn
TUBA	Dixieland-band instrument
TUBA	Marching band member

TUBA	Big band tote
TUBA	Euphonium relative
TUBA	Marching band instrument
TUBA	Rhythm instrument
TUBA	Brass band member
TUBA	Brass band instrument
TUBA	March instrument
TUBA	The score for "Symphonie fantastique" has a part for it

TUBA	Marching band burden
TUBA	Very big wind
TUBA	Oompah brass
TUBA	Big band wind
TUBA	Heavy wind
TUBA	Low wind
TUBA	Bass brass
TUBA	Oompah maker

TUBA	Sousaphone cousin
TUBA	Sousaphone or helicon
TUBA	Sousaphone, for one
TUBA	Kiddie lit's Tubby, for one
TUBA	Oompah band need
TUBA	Heavy horn
TUBA	Oompah band instrument
TUBA	Oompah sounder

TUBA	Oktoberfest band horn
TUBA	Part of an oompah band
TUBA	Lowest-pitched instrument
TUBA	It goes oom-pah-pah
TUBA	Sousaphone's cousin