Translate number pairs to guitar notes
JavaScript (ES6), 79 70 bytes

a=&gt;a.map(([s,f])=&gt;"AA#BCC#DD#EFF#GG#".match(/.#?/g)[(s*7+(s&gt;2)+f)%12])


Requires 1-based strings. Edit: Saved 9 bytes by directly calculating the string to fret conversion, based on @nimi's old answer.