VOCALOID

"VOCALOID" refers to Yamaha’s proprietary singing synthesis technology and compatible software applications.
Users simply input notes and lyrics, and the software converts them into vocals, which can be sung with voices selected at will from the song library.
Songs created with VOCALOID have found immense popularity on video portal websites, and CDs featuring vocaloid songs have even entered the charts and are popular choices for karaoke; they are a firmly established part of modern music culture.