I made a point, early on in my broadcasting career, of not back announcing a music set by saying, "OK, that was..." It's too easy to fall back on that crutch. I was more likely to say something like, "(Station's call letters) with new music from (the name of the artist...)"
Even on a casual, noncommercial station where every DJ is a volunteer, "OK, that was..." makes you sound like you just woke up or can't think of anything else to say.
