Let's start jamming แสง ธรรมดา - ซาไก chords, familiarize yourself with these chords - D, Bb, C and Bb in sequence. Begin your practice at a relaxed 59 BPM, then work your way up to the song's BPM of 119. Adjust the capo based on your vocal range and chord preference, keeping the song's key of Bb Major in mind.
