Somachord Tone
Prime Theme tracks (Varzia)
Fifteen Prime Warframe signature themes: Gara, Gauss ('Redline'), Grendel, Hildryn, Hydroid, Khora, Nekros, Nidus, Oberon, Octavia, Protea, Revenant, Vauban, Wisp and Yareli Prime.
Where to find it
Bought from Varzia, Maroo's Bazaar (5 Aya each)
Related
Varzia, Prime Resurgence