Bishop g5, I Castle Long
4.Bg5 Bg7 · sung from White's side
Verse 1
He plays the Pirc, I plant e4 and d4
My bishop on g5 eyes f6
Queen to d2, bishop to h4 5.Qd2 h6 6.Bh4
His h-pawn moved, the hook is fixed
Chorus
Bishop to g3, I castle long 6...g5 7.Bg3 Nh5 8.O-O-O
His pawns on g5 and h6 look wrong
Queen to e3, my queen eyes g5 8...Nc6 9.Qe3
King on c1, the storm arrives
Verse 2
He plays e6, my knight to e2 9...e6 10.Nge2
Pawn to h4, my h-pawn comes through 10...Bd7 11.h4
His pawn on g5 is the lock I break
Push e5 too soon, that's the one mistake
Six games in ten, the point I take
Chorus
Bishop to g3, I castle long 6...g5 7.Bg3 Nh5 8.O-O-O
His pawns on g5 and h6 look wrong
Queen to e3, my queen eyes g5 8...Nc6 9.Qe3
King on c1, the storm arrives
The hook is the whole system in one breath: the bishop on g5 provokes h6 and g5, the king goes long, and the queen on e3 together with the h-pawn turns those advanced kingside pawns into the target.