Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card can be treated as 2 Tributes for the Tribute Summon of a Fairy-Type monster. After this card is Special Summoned to your side of the field, you can Normal Summon 1 "Melodious" monster during your Main Phase this turn, in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)
--幻奏の音女セレナ
--Serenade the Melodious Diva
local s,id=GetID()
function s.initial_effect(c)
	--double tribute
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_DOUBLE_TRIBUTE)
	e1:SetValue(s.condition)
	c:RegisterEffect(e1)
	--extra summon
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_CONTINUOUS)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetOperation(s.regop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_MELODIOUS}
function s.condition(e,c)
	return c:IsRace(RACE_FAIRY)
end
function s.regop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetFlagEffect(tp,id)~=0 then return end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetDescription(aux.Stringid(id,1))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetTargetRange(LOCATION_HAND|LOCATION_MZONE,0)
	e1:SetCode(EFFECT_EXTRA_SUMMON_COUNT)
	e1:SetTarget(aux.TargetBoolFunction(Card.IsSetCard,SET_MELODIOUS))
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
	Duel.RegisterFlagEffect(tp,id,RESET_PHASE|PHASE_END,0,1)
end