the second lowest adult male singing voice
"The choir director asked the tenors to step aside so the baritone could take the solo in the lower register."
the second lowest brass wind instrument
"The concert band director instructed the baritone player to adjust his slide so he wouldn't get lost in the tuba's low notes."
The male voice between tenor and bass
"After auditioning for the role, the director cast him as a baritone because his rich yet agile timbre fit perfectly between the higher tenors and lower basses."