If you control no monsters, or all monsters you control are "Solfachord" monsters: You can Special Summon this card from your hand. During your Main Phase: You can activate this effect (you can also Tribute this card); Special Summon 1 "Solfachord" monster from your hand, except "Solfachord Solfegia", or, if you Tributed this card when you activated this effect, you can Special Summon from your face-up Extra Deck or GY instead. You can only use each effect of "Solfachord Solfegia" once per turn.