I guess I'm in a real '70s mode: Grace Potter & The Nocturnals (the most well known artist on my list for this week) are definitely '70s kids. They may not be old enough to remember the '70s, but their music is definitely very '70s: they remind me a lot of Heart in the '70s (a point that was hammered home when Ann and Nancy Wilson joined Grace Potter & The Nocturnals onstage at VH1 Divas last month). Their new self titled album has a bit more glammy and less hippy of a vibe.
The Duke and The King are another very '70s-ish band. Led by Simon Felice, formerly of the The Felice Brothers, they are a bit funkier than that band. They're another American act that you can't really find in America: I couldn't find their songs on iTunes, but I did find "Shaky" on a CD that came with an issue of the British music magazine Uncut.
We may talk about some other new bands, but this is a handful of artists that I figure lots of people aren't familiar with yet. Hope you hear something you enjoy!