I decided to look through my iPod in case you wanted more suggestions:

American authors, they are alternative rock and have some catchy songs such as, hit it, believer, best day of my life, etc.

Albert Hammond Jr. He is part of the band The Strokes, however he also does solo music. Most of his music sounds a lot like The Strokes, so if you end up liking The Strokes, then I think you’ll like his solo music as well.

The Black Keys, they are a blues rock duo. Some of their songs are slow but they have some really fun energetic ones such as, Gold on the ceiling, hell of a season, mind eraser, fever, etc.

Capital Cities, this is indie-pop. Perhaps you’ve heard their song, Safe and sound. If you liked it, you make like the rest of their music. It’s fun, upbeat, and happy.

Daft Punk. Electronic music. While not all of their songs have vocals, there are some pretty upbeat ones from their last album, Random Access Memories. Good songs off this album are, doin’ it right, get lucky, and lose yourself to dance. Those are the upbeat ones. However, some other good ones are, Instant crush (vocals by the lead singer of The Strokes, Julian Casablancas) and Giorgio by Moroder (it’s calm but has a nice rhythm).

Foo Fighters, if you like The Strokes and Arctic Monkeys you might like them.

The Fratellis, a Scottish rock band. Popular among fans of Modest Mouse, Arcade Fire, Franz Ferdinand, etc. It’s a cool band with upbeat music. They have a very distinct sound.

Imagine Dragons. I don’t really like their new stuff. Their old music, up until Night Visions is amazing. It’s really upbeat and happy. Try, On top of the World, It’s time, Tiptoe, Amsterdam, Working man.

Owl City, really happy music for the most part. Electronic. I find the lyrics to be very interesting and dream like. Some great songs would be Alligator Sky, Strawberry Avalanche, Deer in the Headlights, Galaxies, Plant life, Rainbow veins, fireflies. I could go on and on about good songs by him. I haven’t listened to Owl City in a long time, but just writing about it, this is what I’ll be listening to tomorrow. Nothing puts me in a happier calmer mood than his music.

Panama Wedding. Very small synthpop group. Great music. I’ve listened to four of their songs and they are great. Try, all of the people, uma, trust, and feels like summer.

While I still have these artists on my iPod, I haven’t listened to any of them in quite a while. These days I’ve been leaning more towards my hard rock music, but after writing this list to you, I just can’t wait to start listening to them again.

Let me know if this helps.