I keep my entire music library on a very large external hard drive, connected to my iMac in my home study. There is a second hard drive dedicated to backing up the first automatically. The iMac is the perfect spot for me to manage my program because I also have an external microphone available for creating radio spots. For transferring music from vinyl and Digital Audio Tape, I have a DAT player/recorder and a turntable connected directly to the iMac. For production and transferring I use a combination of GarageBand and Audacity, both of which are free and easy to use.
A majority of my iTunes library is a combination of the CDs I have collected over the years, my wife’s CDs from before we were married, and the collection she and I have purchased via iTunes over the years. Streaming may be the future, but with satellite Internet with severe data transfer limitations, CDs and iTunes downloads are still how I accumulate music.
When it comes to how I get music from the home library to the station, I use my second-hand iPad 2, with my iPhone 5s as my backup. I find it easier to manage playlists which sync between the iMac and the devices than to share libraries between computers.