Premise: Kathryn Jane Calder (born June 17, 1982) is a Canadian indie rock musician, who performs as a solo artist, and is a member of the band The New Pornographers. She is a former member of Immaculate Machine. Calder started with The New Pornographers by filling in for Neko Case for live performances and was made a permanent member in 2006.
Hypothesis: Calder practiced music more diligently than Case.