Listen to Soft Key Variations online. Soft Key Variations is an Unknown language song and is sung by Ultrasonic Subliminal Suggestion Program, Uplifting Beats and Uplifting Melodies. Soft Key Variations, from the album Harmony in Lofi: Soothing Music Tones, was released in the year 2025. The duration of the song is 3:36. Download Unknown songs online from JioSaavn.