I have recently realized just how old I am by listening to contemporary r&b, slap is totally absent. Outside of some urban Gospel and Smooth Jazz, it is no longer heard in Pop music. Also bass is mixed much lower than it was back in the Seventies and Eighties. I was really struck by how much the bass is in the back when I saw Lil' Wayne on Saturday Night Live two weeks ago. I ain't complaining though. Slap will likely come around again just P-basses and flats have come back now.