The 44-year-old French musician, who has been behind hits for Black Eyed Peas, Jessie J and Nicki Minaj, said he only wanted her to appear on huge club track 'Titanium' when he heard the way she sung it to him, reported Contactmusic.
"When we recorded 'Titanium' she was like, 'Well David, I don't want to be an artist anymore. I'm done with this life. I just want to be a songwriter. I don't want to tour. I don't want to do anything like this anymore.'
"When I heard her voice on the track, I was like, 'That is insane. No one is going to be able to do better than this.' So she was like, 'OK. Last one!'," said Guetta.
The track has been a huge worldwide success, and Guetta had managed to convince Sia to appear in more songs including the chorus of Flo Rida's hit 'Wild Ones'.
"She brought something really special. And we've kept working together on 'Wild Ones' and other records that are coming up. She's really amazing, and I'm glad she didn't totally stop," he added.
