Complex sentence: Composed in the key of F ♯ minor, "Walking on Air" is a deep house song set in a 4/4 time signature at a moderately fast tempo of 128 beats per minute.
Split into simpler sentences: Composed in the key of F ♯ minor, "Walking on Air" is styled in the genre of deep house. It is set in a 4/4 time signature at a moderately fast tempo of 128 beats per minute.