Austin's official motto is the "Live Music Capital of the World" due to the high volume of venues hosting live music performances in the city, sometimes over 100 on the same night. Austin is known internationally for the South by Southwest (SXSW) and the Austin City Limits (ACL) Music Festivals which feature eclectic international line-ups. The greatest concentrations of music venues in Austin are around 6th Street, the Warehouse District, Downtown, Central East Austin, South Congress, the Red River District, the University of Texas, South Lamar, and South Austin.