Sometimes the best new R&B can be hard to find, but there are plenty of great rhythm-and-blues tunes to get into if you have the time to sift through the hundreds of newly released songs every week.

Leon Thomas' "Mutt" is the top dog on Billboard's Hot R&B Songs chart (dated April 12) as it leads the list with a 3-1 jump. On the multimetric chart, which combines streaming, radio airplay and sales ...