Typically the sign outside Rockin' Robin Guitars and Music offers some guitar-related service. Once, for instance, it informed passers-by that the long-running guitar shop could help buyers fix mistakes made purchasing guitars on eBay. But a few days ago the sign changed, and with that change comes one of those end-of-an-era stories. "IF YOU LOVE GUITARS," it reads, "BUY THIS STORE."

A Houston institution, Rockin' Robin is up for sale as Bart Wittrock, who opened the store in 1972 with partner David Wintz, has decided to get out of the business after more than 40 years.

The shop existed at a few locations before settling into its distinctive two-story space on South Shepherd just south of Richmond. It's an eye-catcher, with its giant black and white murals of two Texas guitar greats Stevie Ray Vaughan and Freddie King.

READ ALSO: See what Houston looked like in 1973

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The shop has been a meeting place for musicians both amateur and professional for decades. And it has also served as a go-to stop for out-of-town musicians on tour -- sometimes browsing and other times in need of gear. Members of Mastodon, Dinosaur Jr. and Bela Fleck and the Flecktones have stopped in over the past few years. And locals like ZZ Top's Billy Gibbons and the Geto Boys' Scarface have made it a destination.