Friday means it's time for the weekly music round-up!

(CBS News) Phew, this week was a really tough one! So tough, in fact, that I had to consult with a colleague, Casey Glynn, in order to pick out the line-up (so be sure to shoot any and all praise my way and criticisms hers) (just kidding... or am I?). To start things off, we've got the new music video for Yeasayer's song "Longevity". The music kicks in at about 31 seconds. Take a listen.

So I really dig Yeasayer's unique sound, both instrumentally and vocally. It has a bit of old-school rock mixed with hints of modern dubstep, and even some classical violin to make it stand out in such an interesting way.   The seemingly unlike elements all end up complementing one another and make for an excellent new sound to a band I'm loving and will definitely be continuing to watch.

Next in our round-up, we go from original to rendition in the video below with an amazing acoustic cover by Boyce Avenue of the David Guetta (featuring Sia) hit song "Titanium". Check it out.

So your blogger here is often a total sucker for acoustic versions of songs, sometimes liking them more than the original (the Foo Fighter's legendary and sad "Everlong" is an excellent example).  But regardless of any biases I might have, there is no question that this cover of the popular song "Titanium" has been given an amazing re-interpretation by Boyce Avenue that they really make all their own. The powerful (now male) vocals and toned down instrumentals with less of a club groove edge give an almost operatic element to the cover. Well done, Boyce Avenue!

And for our next item in this trek down music lane, we turn the focus from the auditory to the perceptible (okay, from sound to visual).  Don't worry, we're still sticking to music.  Prepare to be blown away by the video project below that pushes the boundaries of motion and sound.

So did I call it? Are you blown away right now? If so, put yourself back together quickly, because we still have more music to go!  The astounding video experiment is entitled "The V Motion Project" and was posted by Vimeo user Assembly who writes about the work:

We created and designed the live visual spectacle with a music video being produced from the results. We wanted it to be clear that the technology was real and actually being played live. The interface plays a key role in illustrating the idea of the instrument and we designed it to highlight the audio being controlled by the dancer. Design elements like real time tracking and samples being drawn on as they are played all add to authenticity of the performance. The visuals are all created live and the music video is essentially a real document of the night.

Seriously, this one really just goes to show what amazing things can happen when creative people and modern technology come together to make new and unique projects happen!

And, finally, as we often try to do in our Friday music round-up, we end this post on a lighter note. It's definitely also a bit of an odder note. I think "silly" may even work well to accurately describe this one. Watch actor Hunter Davis give a dramatic interpretation of Sir Mix-A-Lot's "Baby Got Back" as if it were performed by - wait for it - actor Sir Ian McKellen. Yes, you read that right and can probably imagine where this one is going. I'd possibly even recommend hitting play and closing your eyes to get the full effect of this performance.

I'd say that's a pretty accurate impression of what it would sound like if Sir Ian McKellen performed the mega-hit 1980's song by Sir Mix-A-Lot, right?  Which will sadly probably never really happen (but would be awesome if it did).  Oh, well, I hope you enjoyed this week's music round-up (cough, and remember my colleague Casey Glynn had a hand in it if you didn't, cough) and make sure to keep coming back to The Feed for all your viral (and music) video needs!

UPDATE: We just couldn't help ourselves, so went ahead and added a second helping of amazing music to up your ante before the long Labor Day holiday weekend. Hope you all enjoy!