transfer music files to Nexus 4 from computer with Windows 7
With my Nexus 4, that directory - which shows up as Internal Storage in Windows - can be located at a few different places depending on configuration. The places that I know of include...


/mnt/shell/0/
/mnt/shell/emulated/0/
/mnt/sdcard/

Most of the time, there's a link to this folder (So you don't need to find it) at: (If this works, don't worry about the above directory paths too much)
/sdcard/

This means that you should probably be able to find your music at /sdcard/Music/.


Another note: I don't know if the default music player supports FLAC audio. If it doesn't, then that would explain why it isn't locating the music automatically.