ShareMyPlaylist.com

The news this week that Spotify is to open up its code to third party web developers should be – literally – music to your ears.

If you use an iPhone you’ll know all about the benefits that come when geeks in bedrooms channel their immense talents into making apps for free. Where would the world be without the iFart, for example?

Joking aside, some indispensable homemade apps are out there – not just for the iPhone but for Twitter too. If you use Twitter then try out Twitterfox, PowerTwitter, Twitterberry and Tweetdeck today – all revolutionise what you can do with Twitter and where you can do it.

Which is why the prospect of a similar bunch of add-ons for Spotify is really, really exciting. What the bedroom nerds will come up with, I have no idea. But you just know there will be some treats in store – and very likely all for free.

Which leads me onto these three great new music sites that should add a little fun to your weekend.

We Are Hunted wants to be the definitive online music chart, made up not from purchased downloads but aggregated from what people are actually listening to and talking about on “social networks, forums, music blogs, Torrents, P2P Networks and Twitter”.

Their daily chart of what they claim are “the 99 most popular songs online” is eye-opening, and will undoubtedly deliver great new tracks you’ve never heard each week. It could do with more work on splicing it into genres (of their current top nine I like about four of the tracks, no offence DJ Zebra) but it’s a fun and useful idea.

Next up, Share My Playlists is already attempting to harness Spotify, and is doing a top job.

In essence it makes user playlists searchable – but it does so in a really attractive way that packages everything up like a shiny aisle of CDs in HMV. It captures the ‘making a mixtape for a mate’ spirit of old, and means that everyone of us is now a music publisher, putting out our own compilation albums and designing the album artwork. Genius.

There are some real gems in there too. I’m loving this The Sound Of March 2009 playlist and this exhaustive translation of music journalist Garry Mulholland’s The 500 Greatest Singles Since Punk And Disco list into an instantly-listenable feature.

Finally – music social network MOG relaunched this week, setting out its stall as (to quote founder and CEO David Hyman) “the Huffington Post of the music business.”

Combining user opinion, blogs and reviews with a We7-esque music streaming service (with code that is – yep, you guessed it – open to third party developers) seems to be the plan. It’s well worth a look.

Hope you enjoy them. Let me know what you think in the comments below.