キャプテン・アメリカ/ザ・ファースト・アベンジャー
In September 2014, Christopher Lennertz officially signed on to compose for the series, having previously composed the "Agent Carter" One-Shot. Lennertz combined all the different style elements of the show in the music, such as mixing jazz and period elements, with orchestra and electronic elements. In his research of the music of the time period, Lennertz learned that jazz was shifting from big band to smaller ensembles, and bebop was being introduced. This allowed him to incorporate trumpets in his scores, to harken to the time period and because they are "also very sneaky, and it lends itself to espionage". Lennertz used the alto flute to capture "Carter's aura", saying, "It feels like a strong woman's voice, especially as she's sneaking around...it also has that spy quality." Additionally, Lennertz was able to reorchestrate "" for the season, which is originally by Alan Menken for "Captain America: The First Avenger", and introduced a folk choral piece performed by a Russian men's choir during "The Iron Ceiling". A soundtrack album for the season was released on iTunes on December 11, 2015.