Missing music after subscribing to Apple Music

Today I bought the family subscription to Apple Music two days after the free trial was up. When I opened it up on my iPhone 6, only the music saved to my phone showed up. I'm missing upwards of four-hundred songs and I've tried everything. They all still show up on my Macbook but after resetting my phone twice, logging out and back in, and syncing my phone with iTunes three times, I still can't access my music. Any suggestions would be greatly appreciated.