A cappella used to be that hobby for dorky kids in choir, but thanks to shows like 'Glee' and 'The Sing-Off,' it's the still-dorky but sort of zeitgeisty way to impress girls. Take a tip from Andy from 'The Office' and join a group with a bad pun like 'Nothing But Treble' and watch the ladies flock to you. Can't find anyone to sing with? Don't worry, that's why YouTube was invented (that was not why YouTube was invented): to showcase your ability to sing every part of every song, ever.

Today, we celebrate some of the best, and weirdest, one-man a cappella multitrack performances.

Sam Tsui

This young Yalie has proven that sites like YouTube and MySpace can be the best place to promote your music in the 21st century. Who needs 'American Idol' or a record label when you have 3.5 million views for your cover of a cover of Journey's 'Don't Stop Believing'? (BTW, he's doing the version from 'Glee'.) Check out his insane collection of everything from Lady Gaga and Michael Jackson medleys to his web-show 'College Musical' here.

Naya Marie

Here we have an example of a variant of the "foursquare a cappella," where the performer singles out each section of the music to cover, then samples them all together with each part in a different box. Naya here does 5 parts instead of four to cover Lady Gaga (the most popular artist to medley, apparently!), but same basic principle. May we suggest a cover of Paper Planes next? We'd love to hear Naya do that cash register sound effect.

Del Soul

We love YouTuber Del Soul because he uses his five-square to name what parts he's singing. It's like a 'Sesame Street' sketch or something, but with Jason Mraz. We're having fun and learning. Del covers mainly R&B ballads, so if that's your thing check him out here.

MaverickWC

A little flat, but A for effort and good song choice, Brandon. And the harmony isn't bad either.

Richalvarez

Shows you how far these a cappella things can really go...Rich here picked a particularly hard piece (Coldplay? Really? Why not just go for Radiohead?) and ended up on the band's official website.

François Macré

BEST. This is how multitracks ought to be done. Some glitter, some sparkle, some French guy using iMovie to create a flashy experience. Oh, and he's really friggin' talented. Go check out his other stuff now. Do it.

Corey Vidal

With over 7.5 million views, do we really need to analyze why this kid singing dialogue from 'Star Wars' to the John Williams score is perhaps the all-time best example of a one-man a cappella? Unfortunately we do, as Vidal is actually lip syncing along to an a cappella group called Moosebusters. Fortunately, he redeemed himself by posting a video of the original. And still, cool idea.

Ashkan Mazarei

The ultimate hipsterpella, Mazarei made a minor viral splash when he performed all the parts of 'Knights Of Cydonia' by the indie band Muse in front of a green screen. It sort of sounds like an awesome video game.

Matt Muholland

What better song for a multitrack than Daft Punk's 'Harder, Better, Faster, Stronger'? But if movie themes are more up your alley, Matt's also got a cover of Ghostbusters that you might enjoy.