Features the music underscoring Clara and Twelve’s scene in the TARDIS, as well as the Eleventh Doctor’s cameo.
Destroy You Murray Gold Uploaded by WhoFan9 Deep Breath (2014)
Possibly features the Doctor’s new theme, although it’s a little too soon to tell. Peppered through out Deep Breath the interval of a 6th, A up to F (also the interval of the first two notes of the Doctor Who theme itself), followed by a perfect 5th, G to D. You’ll hear it in the brass at 0:19-0:34.
This motif can also be heard during the Doctor’s horse ride across London, as well as during his talk with Clara in the TARDIS.