There are two artists named Harco:
1) HARCO (Yoshinori Aoki) is a Japanese singer-songwriter, multi-instrumentalist, and producer who has been active since 1997. His music gained considerable popularity in the mid 2000s from several of his songs (such as 世界でいちばん頑張ってる君に and BE MY GIRL ～君のデイリーニュース～) being used in television commercials. He has since gone on to form collaborations with other musical entertainers (such as writing a song for singer YUKI, and forming a duo with Sukpatch called Harcopatch) and artists of other mediums, such as a soundtracked painting exhibition with painter Mayumi Oku. He has also written music for the NHK TV series Miracle Mimica. His most recent album is titled ki CO E RU? (Can You Hear Me?).
2) Harco is a punk band from Baltimore, Maryland, United States. The members of Harco also play in the bands Whoarfrost and Accent Wall.