On a Nexus 4 music downloaded from Google is supposed to be stored in Andriod/data/com.Google.android.music/cache/music. Even thought I have 4 songs downloaded onto my phone, the cache folder is empty. But I had a music file saved in my dropbox account. Using a file manager app I moved that music into a new music folder in my phone. I was able to locate this folder via the iDrive and the music sounds great on the standard speakers. I am going to think twice before using Google music to upload and download music.
Thanks a lot for your suggestions.