music, and that's because these days most pop music is done by a producer sitting with a laptop and VSTs.

Horns (and ESPECIALLY saxophone) are pretty difficult to accurately duplicate with synths and VSTs, so unless a producer is sampling a record with a sax you're not going to see it as much. Cat's like Bruno and Justin Timberlake use them, but even if someone wants to bring in a sax player it takes a certain level of skill to record and mix properly, and you don't have nearly as many pop records being made in studios with professional engineers handling the work.