The phrase "upright bass" refers to a large musical instrument that is played standing up. It has a deep-sounding tone and is commonly used in jazz, classical music, and some forms of rock. Full definition
The fact that this song matches her smoky voice to smooth drums and a silky upright bass can only help. (elitesingles.com)
My dad played upright bass in local Irish band The Leftovers throughout my adolescent and teen years so I basically grew up in South Buffalo bars. (buffalonews.com)
The earbuds translate the subtle dynamics of the band's upright bass in a way you typically only hear and feel when you're in a room with one, even if it doesn't thump you in the chest. (theverge.com)