Kind of an interesting theme of putting songs into genres that they clearly do not belong in by taking their titles literally. WHITERABBIT (17A: "Hip-hop" song of 1967) is the only one requiring a slight "leap," if you will, by using the fact that rabbits "hip-hop" along. KNOCKONWOOD (29A: "Rap" song of 1965) is more of a 1:1 relationship, and the last two use actual words in the titles. None of the songs was written fewer than 40 years ago, but still, I enjoyed it.
The puzzle as a whole, on the other hand, felt kind of stale. When's the last time "38A: 'No, No' woman of Broadway" (NANETTE) was in production? And "1A: Afternoon TV's Dr. ____" (PHIL) might still be doing a show (I have no idea, really) but his cultural significance has long been in decline, hasn't it?
Furthermore, the AMISH (32A: Mennonite group) are not Mennonites, are they? I thought they were distinct groups? Sure, they're both religious, but I think it would be like calling Congregationalists a Baptist group.
ITNO, AONE, TETRA, OKIES… it didn't have much to grab onto but the theme, and even though I liked it, it wasn't enough.
Favorite clue: 22D: Fictional Tom or real-life Diane (SAWYER).