Should n’t écrit agree with the feminine chanson

Question

Le chanteur a interprété trois chansons, dont une qu'il avait écrit spécialement pour l'occasion.  -> qu’il avait écrite

Accepted Answer

Hi Tina, 
Thanks for pointing this out, you are quite right and it has now been corrected.
Bonne Continuation!

Answer

Hi Tina,I don't think so.   Why? dont (of which -- complément d'object indirect) therefore "une chanson of the three" is an indirect object.This is my understanding of the text.Hope it helps.Jim

Answer

I think you are right, Tina, and it should be écrite. The verb écrire takes a direct object, which, in this sentence, is que (referring to la chanson). Therefore, the participle needs to agree in number and gender with la chanson.