To jam and learn Mordechai Ben David - Psach Lanu Shaar chords, your primary focus should be mastering these chords sequence: B, Gb, Abm, Ebm, Abm and B. I suggest starting at a calm pace of 61 BPM, and as you gain confidence, approach the song's BPM of 123. Tune your capo to accommodate your vocal range, referencing the song's key: Ab Minor.