4 free classical/jazz music albums and 5 pop/rock songs for Canadians (possibly also elsewhere):
Full albums:
- The Sound of Yo-Yo Ma (Google Play Exclusive) @ Google Play (available to Canadians)
- Play: Classical Tenors @ Google Play (available to Canadians)
- Play: Jazz Pioneers @ Google Play (available to Canadians)
- Play: Blues Pioneers @ Google Play (available to Canadians)
Singles only (scroll down to obtain freebie):
- Take Me to Church by Hozier, track #1 @ Google Play (available to Canadians)
- Chandelier by Sia, track #1 @ Google Play (available to Canadians)
- Come With Me Now by Kongos, track #2 @ Google Play (available to Canadians)
- Uptown Funk by Mark Ronson featuring Bruno Mars @ Google Play (available to Canadians)
- All About That Bass by Meghan Trainor @ Google Play (available to Canadians)
And there's an intermittent ad on the main Google Play Music store page which says
Get 75% off an Album for one album. The fine print says it's available through Jan 29th for US, Canada, UK, Germany, and Mexico. Applies to some sort of select list (apparently the bestselling/recommended for you stuff on their front page), with an automatic discount at checkout once you redeem the offer by clicking on the banner.