The lead singer of the group is Armen Grigoryan ( Ð Ñ Ð 1\/4 Ð Ð 1\/2 Ð `` Ñ Ð Ð Ð 3\/4 Ñ Ñ Ð 1\/2 ) . The groupâ s front man ( and main song writer ) is Armen Grigoryan ( Ð Ñ Ð 1\/4 Ð Ð 1\/2 Ð `` Ñ Ð Ð Ð 3\/4 Ñ Ñ Ð 1\/2 ) .