Or Excel if you have it and fill series in the next or previous column

Ordering alphabetically is easy enough. And you have columns for "has sung" - I suggest some sort of timestamp too. You can record (or write) a simple macro to set a cell with "Now" in text/date format. But it would be so much easier to have a button invoke it. With a bit of programming you could have it look for previous timestamps and stamp in adjacent columns. Anyone going that route - I could write the macro for you, it doesn't seem complex to my eyes. PM me. I enjoy a challenge.