When you break a string and you’re Stevie Ray, you signal René Martinez and you switch guitars mid-song with more grace than a Balanchine pas de deux.
https://youtu.be/JIFdMbhCa94
But when you’re B.B. King, and there is only one Lucille, you change the string during the vocal.
https://youtu.be/MXwBsxTBxGM