Fine tuning

Music on Mondays - the first for a while - a vocal and guitar performance that was a total delight.  Before the audience arrives, the guitarist carefully fine tunes his guitar - there's an app for everything...   Performing to a room crowded with fellow students and teachers, such a lovely interlude in the day. 

Mono Monday 162, kindly hosted by Kangazu who suggests the theme "F is for ... "  so, my response is "F is for fine tuning" :))