NASHVILLE, Tenn. — Marty McFly grabbed a guitar in "Back to the Future" and rocked out with the band at a 1950s high school dance, helping him narrowly avoid blinking out of existence before time-traveling back to the 1980s. The guitar, in real life, wasn't as lucky. Filmmakers went looking for the instrument while making the movie's 1989 sequel, but even now it's nowhere to be found. Four decades after the blockbuster film debuted, the guitar's creator has launched a search fo

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