Just go to filestube.com and execute a search for whatever band/album.
The site is basically a search engine for file-hosting sites. You simply pick which host you'd like to download the file from. (it's tricky at first if you're not used to file hosting sites, as you may be tempted to believe you have to pay or sign up, but just look for the "slow download" or "free download" options and you'll be fine.)
You should be able to find most of what you're looking for that way, provided it's not so obscure that not even hipsters know about it.
Edit:
Skip any Filesonic hosts, and Megaupload, as both of those are down.
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