Enjoyed this grid very much.

very good did not know wicked songs

I sat through the musical in London a few years ago, unfortunately, just to see what all the fuss was about. It is the only time Chris and I have been to the theatre and, at the interval, debated whether or not we should go back in for the second act. In the end, we did; but we could just as well have passed.

needs red herrings. It was too easy to find the groups as each answer only had one possibility. i.e. only 4 lakes, only 4 characters from TBBT, etc.