My first introduction to anime music was Ikimono Gakari. The lead singer was amazing. She sung the Naruto Shippuuden OP Blue Bird and so many other OP and ED songs.
Never mind I checked the playlist and saw you already did it but I hope you liked it because of Lisa and some other Japanese singers I am a big fan of J Rock ever since I discovered Lisa
My first animes were technically Naruto and dragon Ball but the one that made me want to fully explore different ones is sword art online not only because of the intro but because of the way the story was and I followed Lisa's songs in anime like ever since she makes some of the best openings