I've seen other writers talk about which music they were listening to while writing now and then, so I figured I may as well do the same. If Surface was a movie or a TV series, and copyright was not an issue, this would be its soundtrack:

Pachelbel - Canon in D https://www.youtube.com/watch?v=PkSp8wc8lKw (Bridges’ Theme)
Robert Johnson - Crossroad Blues https://www.youtube.com/watch?v=GsB_cGdgPTo (Sand in the Gears)
Jeremy Soule - Fire Eyes https://www.youtube.com/watch?v=QXd1P54rIzQ (Saved – Ogun’s Theme)
Konami Kukeiha Club - Heart of Fire https://www.youtube.com/watch?v=yq_heq7GLI8 (With Strange Aeons)
Greater Than One - I Don’t Need God https://www.youtube.com/watch?v=mjslqLHUlDM (Mandrake’s Theme)
Michel Rivard - Je voudrais voir la mer https://www.youtube.com/watch?v=hcCZsLgh5Ks
Bia - Inti https://www.youtube.com/watch?v=p0vmzWBl0sE (Rods and Cones)
Charles Trenet - La Mer https://www.youtube.com/watch?v=fd_nopTFuZA&index=4&list=LL4hn2kzgwCrb2MA8CHnSxqQ (Saltwater)
River Ocean Ft. India - Love and Happiness https://www.youtube.com/watch?v=ay89SX8fuqo (Mano's Theme)
Dark Rift - Nikki https://www.youtube.com/watch?v=QOUYmvWqLSo (Soma's Theme)
Blue Man Group - Rods and Cones https://www.youtube.com/watch?v=W-yLfm5HsHc (Boko’s Theme)
Porter Robinson - Sad Machine https://www.youtube.com/watch?v=HAIDqt2aUek (Saved – Rakim’s Theme)
C Cat Trance - Shake The Mind https://www.youtube.com/watch?v=Xd5VHCqr6Fw (Fear to Tread)
Jeremy Soule - The Rat's Chamber https://www.youtube.com/watch?v=naA2cWGP_M0 (Mnemos' Theme)
Skye Edwards - The Sea https://www.youtube.com/watch?v=VnCS25z18pI&index=1&list=LL4hn2kzgwCrb2MA8CHnSxqQ
Vast - Touched https://www.youtube.com/watch?v=Rpx_PcZjByY (Fugue's Theme)
Pink Floyd - The Trial https://www.youtube.com/watch?v=FCMHmDnfD6I (Maat’s Theme)
Vampire Weekend - Unbelievers https://www.youtube.com/watch?v=pv1Ahv2lO0I (Eli's Theme)
Jefferson Airplane - White Rabbit https://www.youtube.com/watch?v=jIyMBuM5AVw (Klein’s Theme)