Answer: oompahs

AnswerCrossword Clue
OOMPAHS

Tuba section sounds

OOMPAHS

Tuba tones

OOMPAHS

Marching band lows

OOMPAHS
Brass-band sounds
OOMPAHS
Tuba sounds
OOMPAHSToots on the tuba: Slang.
OOMPAHSMarching bands' sounds
OOMPAHSBrass band sounds