Sound Tribe Sector 9 (STS9) is an instrumental band whose sound is based heavily on instrumental rock and electronic music, funk, jazz, drum and bass, psychedelia, and hip hop, originating in Georgia, United States. Self-described as "post-rock dance music," the band mixes standard live rock instrumentation with electronics, favoring group rhythm over individual solos.

Beginning in the fall of 2006, as part of their Live as Time Changes tour, STS9 traveled across the country in a carbon neutral tour bus and powered their live concerts using renewable energy. The band aimed to offset 100%, or about 138,000 pounds, of their carbon dioxide emissions from their tour by donations of Renewable Energy Credits from their partnership with environment-friendly companies