Hello, I also accompany a singer, I have searched a lot on the net to find accompaniments, but niet. So I copy on the songs that are on youtubes (because it is more practical) I transpose for the singer etc. At the beginning I spent a lot of time, but with the training I spend less time. It all depends on the level of accordion you have, because depending on the chord you have to do arpeggios, triplets, .... or look for some counter-songs... if I can help you with some arrangements that I wrote myself, don't hesitate, it's not "Mozart" but it can give some ideas. good day sylvie