Shingeki no Kyojin (Attack on Titan) Original Soundtrack : Hiroyuki Sawano : Free Download, Borrow, and Streaming : Internet Archive

Here is the original soundtrack from the anime series. Some songs are both English and Japanese.

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ANNIE KICKING BUTT HYPE! - Attack on Titan: 16.5 Lost Girls Wall Sina, Goodbye OVA REACTION : CaptaInoteboat : Free Download, Borrow, and Streaming : Internet Archive

High Fidelity Emporium: Soundtracks : Free Audio : Free Download, Borrow and Streaming : Internet Archive

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Aot Requiem Part 4

Shingeki no Kyojin S2 Original Soundtrack [MP3/320K/ZIP][2017.06.07]

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Shingeki no Kyojin Original Soundtrack Collection [MP3/FLAC]

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ATTACK ON TITAN - ORIGINAL SOUNDTRACK I : Hiroyuki Sawano : Free Download, Borrow, and Streaming : Internet Archive

進撃vc-pf20130218巨人, Attack on Titan Wiki

Hokuto Yuki Blog: Shingeki no Kyojin Original Soundtrack

Attack on Titan: Original Soundtrack I - Titan Invasion, High Quality

EREN VS REINER! - Attack on Titan - Season 2: Ep 32 / 7 Close Combat REACTION VIDEO : CaptaiNoteboat : Free Download, Borrow, and Streaming : Internet Archive

High Fidelity Emporium: Soundtracks : Free Audio : Free Download, Borrow and Streaming : Internet Archive