Since you didn't state any particular genres, have a nice little list from a blender:
1. Arctic Monkeys (British Pop rock)- Amazing band with amazing songs. IMO: Fantastic.
Recommended songs: Brian Storm, Fluorescent Adolescent, From the Ritz to Rubble (My favorite) and D is for Dangerous.
2. Pendulum (Drum and Bass)- Another British group. Drum and Bass guaranteed to make you want to flail around like a crazed chimp. IMO: Simply amazing. I love most of their songs.
Recommended songs: Vault (My Favorite), Masochist, Hold Your Color, Fasten your Seatbelt, Through the Loop, Granite.
3. Aesop Rock (Rap)- A white guy from NY with a gravely voice singing in metaphors. It's good, bro.
Recommended songs: None Shall Pass, Coffee, Citronella (My Favorite), The Harbor is yours.
4. Lupe Fiasco (Hip Hop)- A truly talented rapper worth checking out.
Recommended songs: Superstar, The Instrumental (both my favorites)
5. Ugly Duckling (Rap)- 3 goofy white guys rap about stuff. Pretty talented and just fun.
Recommended songs: Slap, Turn it Up, Eye on the gold chain, Meatshake.
6. Black Sun Empire (Drum and Bass)- More DnB to thump your brain into the wee hours of the morning.
Recommended songs - breach
I'd post more but this is getting tedious.
Enjoy them in no particular order:
Logistics, Skynet, As I lay Dying, For Today, August Burns Red, Aphex Twin, The Chemical Brothers, Eminem, The Pillows, Ima Robot, Gym Class Heroes, Jay-Z, Argyle Pimps, MGMT, KMFDM, The Ting Tings, Fallout Boy, The Almost, Monty Are I, PhantomenK, Sabrepulse, Firebrand boy etc.