A "session player" is a musician who is hired to play on a recording or in a live performance, but is not considered a regular member of the band. There are many synonyms for this term, including studio musician, hired gun, sideman, backing musician, and freelance musician. These terms all describe a musician who is skilled and adaptable, able to quickly learn and play a variety of musical styles and genres. Session players are often highly respected in the music industry, as they contribute to the success of many popular recordings and live shows. These professionals are not limited by one specific musical style, making them valuable assets to any musical project.