Bass

• an abbreviated name for double bass (this is usually the instrument referred to as a "bass" in Classical music and jazz. Sometimes called a "string bass" to differentiate it from a "bass horn".)
• an abbreviated name for bass guitar (this is usually the instrument referred to as a "bass" in rock & roll)
• a bass horn, such as a tuba or sousaphone-- a wind instrument that fulfills a role similar to a string bass
• an abbreviated name for bass clarinet, bass trombone, bass saxophone, etc (less common usage)

• a basso profondo (or basse noble) is a singer with a particularly deep voice; they may be able to get as low as the B below the bass clef
• by contrast, a basso cantate (or basse chantate) is a singer with a lighter, more lyrical voice, perhaps with a slightly higher range
• Basso buffo is a term used for a comic bass
• sometimes the term bass-baritone is used to mean a singer with a range and tone somewhere between a bass and a baritone (a male voice somewhat higher than a bass)

• BBC Radio's Guide to the singing voice