ARiA was the first TokuP song I listened to, and ever since then, thats the first thing I think about when I hear TokuP. I'm amazed that he's done so much! Thanks for the link with all of his works! Also Ano Hana ED ;_;
MARiA was also the first to get me started with Utattemita, and the GARNiDELiA album is just absolutely amazing. Especially the Piano in ORiON <3.
Overall, I would say that TokuP+MARiA really helped me get into the vocaloid and utattemita fandom, and without them, I wouldn't be here commenting!