Cecile Believe (formerly Mozart's Sister, before 2018) is a solo project by Montreal-based Canadian musician Caila Thompson-Hannant.

[8] She went on to play guitar & synthesizer in the band Shapes & Sizes, which was on the Asthmatic Kitty label.

For the two years following this release, she garnered press attention through playing festivals such as SXSW and Pop Montreal.

On February 18, 2020, Thompson-Hannant released her first solo single under the Cecile Believe moniker, titled "Last Thing He Said To Me In Person", accompanied by its music video and a pre-order of her album Made In Heaven on which it appears.

[18] The mixtape features additional production from PC Music founder A. G. Cook on two tracks ("Crickets" and "Living My Life Over (Extreme Vocal Edit)").