The term 'Tuba Sound' is used to describe the sound of a tuba, which is a large brass instrument. The sound of a tuba is often described as an oom-pah or oom-pah-pah sound. The crossword solutions for this term are OOMPAH (6 letters), OOMPAHPAH (9 letters), and PAH (3 letters). OOMPAH is a shortened version of the oom-pah sound, while OOMPAHPAH is a longer version of the same sound. PAH is a shorter version of the oom-pah-pah sound.