Sill coninued success of some american groups in midst of beatlemania. New styles cross-ferilizaion of american styles & mersey. L. a. becomes of greater importance in pop music. Tambourine man ), bob dylan covers, own songs (i. e. eight miles high ) Other folk rock groups included simon & garfunkel (or tom & jerry), the turtles, the mamas & the. Phil spector was a record producer & songwriter in l. a. who produced music for the crystals, the. Prodded beatles to experiment more while recording sgt. Gary lewis & the playboys was a l. a. -based group that enjoyed success, but broke up when lewis was drated into the u. s. army in 67. Johnny rivers (born john ramistella, but alan freed told him to take a stage name in "58) originally played rock oldies in whiskey-a-go-go in l. a. , but eventually was signed & experimented with folk rock. Most of the folk arists migrated to southern california because they felt neglected by record labels in.