You should now be able to select Music from the list of options, and it'll automatically open the Music app for the next step of the transfer. You should now see a list of all the songs you can ...

Compared to a simple Windows or OSX drag and drop file transfer, as you would an Android device, ... MKV, AVI, FLAC, MP3, MP4 and M4R files all work, as do music formats such as FLAC, ...