There's a song in Attack on Titan season 1 episode 13 at about 13:00 when Eren takes a big rock to the hole in the wall.
What's the name of the song, and where can I legally buy or listen to this song?
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The song title is "Call Your Name" (track #15) with vocals by mpi & CASG.
You can buy the Audio CD at Amazon and it has the full OST of Attack on Titan.