University of Rock & Roll is a really cool store for lots of music-related t-shirts and other accessories. They have all sorts of rock t-shirts, mostly featuring rock groups, performers, bands, and concert tours. The prices are high for some styles, but most shirts are under $20. They also have accessories like jewelry and embellishments. The store is really large and packed full with all sorts of cool stuff. I love their Bob Marley t-shirts in particular, but they were over $20 each.
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