Siblings who can sing often can create harmonies that are greater than the sum of their parts. The fact that voices can be literally related, while still different, can create the underpinnings of a great band (See The Belle Brigade and The Avett Brothers). After getting a huge amount of buzz with a little help from a tweet by Kesha, LA group HAIM added to their hype by ending up on quite a few Best of SXSW lists. The band, made up of three sisters, mixes R&B vocals with old school rock sounds to create something familiar, yet very intriguing, and stunningly simple. Their debut, Forever EP, is available for free download below. Watch out for these girls; they are still young and have plenty of time to take over.