It's obvious what songs or artists are usually for pop or urban radio, but what music does"rhythmic" radio usually go for? Rihanna? Dance songs?

A mixture of Urban and Pop songs ?

In recent years it's basically been a watered-down urban radio with some dance hits here and there.

http://kworb.net/radio/

Click on Rhytmic

Hip-Hop, R&B, and they only play pop hits. Like Timber and Royals are on Rhythmic radio now, but I heard DWUW by Gaga too. Lots of Drake and Rihanna.