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Lossy Complete Albums and Compilations
File formats: MP3, AAC, MPC, OGG, WMA, etc.
Any complete CD albums, whether in multiple files or single file archive (e.g. rar) of a single artist, as well as albums with various artists such as the Now series of compilations (with VA tag); lossy is a class of data compression where compressing data and then decompressing it retrieves data that may well be different from the original, resulting in a release that suffers from generation loss.

Lossless Complete Albums and Compilations
File formats: FLAC, WAV, MLP, APE, TTA, ALS, etc.
Any complete CD albums, whether in multiple files or single file archive (e.g. rar) of a single artist, as well as albums with various artists such as the Now series of compilations (with VA tag); lossless is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data, meaning that those releases were compressed without any loss in quality.

Singles, EPs & Promos
Essentially any audio file which isn't part of a complete album.

Official Soundtracks
Original/official soundtracks (OSTs) of movies, games, TV series etc...

Music Videos
Single song videos as well any concerts, tours etc...