Volume 2 of the Halt and Catch Fire soundtrack recently came out and I've been listening to it on repeat ever since @mwichary flagged it on Twitter.
AMC also has a bunch of playlists on Spotify with music from specific seasons and for different products & characters on the show.
The theme song, one of my favorite little pieces of music ever, is by Trentemøller and can be found here, although you may prefer Paul F. Tompkins' version.