Skip Marley and H.E.R.’s “Slow Down” moves up one spot to top Billboard’s Adult R&B Songs airplay chart dated May 23. The collaboration climbs through a 23 percent surge in plays in the week ending May 17, according to Nielsen Music/MRC Data, the largest jump among all 30 songs on the list.“Down” gives the 23-year-old Marley both his first leader on Adult R&B Songs and first No.