Internet Archive (Archive.org) is widely regarded as a "gold standard" for free, legal access to high-quality audio, particularly live recordings and public domain collections. While users generally find it safe and reputable, the experience of downloading and using "repacks" or large FLAC collections varies based on the uploader's technical care. Review: Internet Archive FLAC Music
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FLAC (Free Lossless Audio Codec) compresses audio without losing any data. When you listen to a FLAC file, you are hearing the audio exactly as it existed on the CD or master tape.