Agents of S.H.I.E.L.D. - "The Cellist" by Bear McCreary.
"Marvel's Agents of S.H.I.E.L.D." composer Bear McCreary collaborates with cellist Eric Byers to create a solo cello performance for actress Amy Acker, for the episode "The Only Light in the Darkness." McCreary has also written extensive notes on the episode.