Khoya Khoya Chand is one of those Mohammad Rafi songs that use high octave singing. It is a hard song to sing, but easy to play on guitar. It was written by Shailendra for the movie Kala Bazaar (1960) with a great composition from S.D. Burman. The song has also a bluesy feel to it that makes it suitable for guitar. I am using D key, but it can sound well on C key. Melody can be played using major or minor pentatonic scales without the blues note.