And there is music which ascends with two – such as ‘hale-luyah’∞Praise-YaH!. And there is music which ascends with one letter – such as ‘hale-liY’∞Praise! – with Yod י. And there is music that ascends with five, such as Hei ה (=5), and this has been stated of the harp of five strings. But music, – which ascends through six, which are A-V-G-Y-T-Tz – it is from Vav ו (=6). And there is that music which ascends with three – and this is Y-H-V (=21), which is EQYeQ (=21), and music ascends through it, with the horn blasts: te-qi’ah, she-varim, te-ru’ah.
How Letter Combinations Unlock Musical Spiritual Power
Tikkunei Zohar 102:15