Some really Good Music related Websites

I am forever searching for interesting and informative sites about music but I especially find it a challenge when I really like a song from a commercial, Tv Programme or Film etc and I can't find it straight away on the net. Fortunately, there are many sites available to find this information out these days, so if the information is not on one site, it will probably be on another. This is good but at the same time, it takes the challenge away if you enjoy the search, however, I guess there will always be obscure songs and artists that wont be on theses sites, so the challenge of searching continues!!
So basically, if you want to find a song that you have heard and like, go to one of the below sites (I am sure there are many more, but these are the popular ones!) and if you can't find it this way, put the name of the song/artist in a the search part of Google and after possibly digging deep with the many small forums around, you may be lucky to find the information you want. In my experience, 9 times out of 10, your search should stop at this point, however, if you are not so lucky, then that's when the real challenge starts. It depends on how desperate you are to find out what the song/artist is or if you have the time of course!

The sites....
1. http://www.commercialbreaksandbeats.co.uk/index.asp - The UK Television Advert Music Database.

2. http://www.soundsfamiliar.info/movies.php - UK Tv Advert Database & Movie Soundtrack Database

3. http://www.whatsthattune.co.uk/ - The definitive guide to music used in UK and Irish television advertisements

4. http://www.soundtrackcollector.com/index.php - An on-line community of people interested in movie soundtracks.