These two people are on a date.  The guy is rather smitten by the girl and looks at her with a strong affectionate admiration.  The girl is enjoying herself and she is being serenaded by the guitar player.  Perhaps they are at a mexican restaurant and the mariachI is playing.  One would imagine that the guy called over the guitar player to play a song that the girl liked.  She is probably having a good time and likes the guy.  They are probably out and are in love or something.  The guy is probably hoping that she is enjoying the date.  He probably puts his arm around her after the guitar player finishes and gives her a small sweet kiss on the cheek. 
