After digging around a bit, these sites offer free .flac (lossless) music, the first link even offers free movies, books, software & images too:
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https://archive.org Just search for FLAC, click the audio file you want to save. Find ‘Download options’ & download the music file.
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http://www.2l.no This is one of the best free lossless music download sites. It provides free hi-res music files that are available in DXD, DSD64, DSD128, DSD 256, MQA, ETC. Visit the 2L website and click HiRes Test Bench. Then you can download hi-res music for free without registration required.
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rutracker.org does. You can translate russian when registering to get through with it and you can get by without reading anything much for actually using it. There are of course browser plugins for auto translating.
people says 1337 is a good option