So many people like to convert YouTube videos to MP3, so they can enjoy great music on MP3-compatible devices like their PC, Mac, iPod, PSP, Zune, Zen, and so on. Billions of people want to keep their favorite videos and MP3 always with them. While there are dozens of desktop applications and mobile apps for the iPhone and Android smartphones, the simplest way doesn’t involve downloading any software at all – rather, there are plenty of great web-based services that’ll transform YouTube’s .flv files into mp3 files in seconds, letting you listen to all of your favorite songs on the go.

Flv2mp3.com

One of the better services around is Flv2mp3.com, a free-to-use web application that’s able to convert flash video files into MP3s from YouTube that can then be saved to your devices. This YouTube converter is dead easy to use – simply find the video on YouTube that you wish to download, copy the URL and paste this into Flv2mp3.com at the top of the page, click “next” and you’re done – the site will automatically begin transforming your chosen video into an MP3 file.

The downloading time will depend on the actual file size and so you’ll be able to grab The Shortest Song by Bryant Odent a lot faster than, say, the Nyan Cat 10 hours original video. On the plus side, Flv2mp3.com assures us that it’s able to download and convert YouTube files much faster than any desktop-based application, and once done, you can simply download the file to your chosen device and you’re good to go.

Flvto.com

Flvto.com is an alternative online YouTube converter service that works in a similar fashion to Flv2mp3.com. Simply copy paste the link from your chosen video into the site, click “convert” and you’re good to go. The site will convert YouTube video files into the standard MP3 format which can then be saved to your device.

One advantage of this site is that it claims to work flawlessly on all desktop platforms, including Mac OS and Linux, and Windows of course.

2conv.com

A third option that SiliconANGLE recommends is 2conv.com, which works just like the above sites and can convert YouTube files into MP3s that can be saved to your favorite device. Once again, the converting process may take several minutes (depending on the file size), before your download is ready to go.

2conv.com is easy to use, with the only disadvantage being that it’s unable to convert videos that are longer than 30 minutes.