The Google Play Store has changed.

Still can go to the Play Music Store
https://play.google.com/store/music

Will have to scroll way down to see Song of the Day

Link to the album The Civil Wars - track #7
https://play.google.com/store/music/album?id=Bc55y47cxo3zjcpldhc5oh4nfou

Direct link to song is below
https://play.google.com/store/music/album?id=Bc55y47cxo3zjcpldhc5oh4nfou&tid=song-Tqfssvqkphpfwn5gbakpjr54xby

Please note:
1. Need a Google Account to purchase this.
2. Need a Credit Card - can get by with any expired cards work just fine. There is no charge.