Post-50s
US's RnR, R&B, Countr influence modern pop
60s - melodic pop [The Beatles, Beach Boys]
70s - Experimental [Led Zeppelin, David Bowie]
& hi commercial groups [ABBA, Jackson 5]
80s - intro. sampling; synths, drum machines popular
90s - dance, hip-hop, more sampling, maj. use of computers
00s - Producers use samples, synths as much as live instruments, many voals use auto-tune to perfect singing