I searched and don't think this is a repost. Unlike an earlier SPG promo for Live Nation Concert Cash this one is much faster and easier (takes about a minute per SPG account) as it doesn't require you to bother with FaceBook or FourSquare.

Per this link:

Just by registering you'll receive a $15 Live Nation® Cash Code® redeemable towards merchandise or tickets to the concert of your choice to see artists such as Coldplay, Lady Gaga, Madonna and more.

Remember, these codes are first come, first served — claim yours today. Check out your options and redeem at spg.com/lnconcertcash.

Whether you're looking for front-row seats or backstage passes, our unique partnership with Live Nation gives you access to some of the most exclusive and exciting shows around the world. And SPG® MomentsSM lets you use your Starpoints® for star-studded experiences with A-list celebrities, renowned artists, world-class athletes and so much more. There's never a dull moment with SPG.