In November 1989, during a live show at Austin City Limits in Austin, Texas, Stevie Ray Vaughan broke a string mid-solo while playing “Look at Little Sister.” Without stopping, he kept the solo going, adapting to the broken string. His guitar tech, Rene Martinez, quickly grabbed a backup Stratocaster and swapped it with the damaged one during a brief pause in the song. The switch was so fast and smooth—done in seconds—that it’s been called the “Formula 1 of guitar changes.”