Engloid

What Is an Engloid?
They are voicebanks for the VOCALOID system that are English.

These softwares are voice synthesizing applications that have been sold commercially since 2004. VOCALOID began from the simple concept of synthesizing the human vocals for singing.

In simpler words, they are basically robots that sing through human singing pitches, but the humans don't ever have to sing the actual song. Unless updating the VOCALOID, the human doesn't need to be there to make a song.