Noise Pop festival is a week-long music festival held across several venues in the city of San Fransisco annually, typically in the winter. It is organized by Noise Pop, a music promoter based in SF. It focuses on indie acts but is not limited to it as it covers jazz and hip-hop as well. It began in 1993, so it has stood the test of time entering its 31st year.
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Various venues in the downtown area
You can also buy tickets for individual shows rather than whole day packages.