Question: When is Per Mathisen's wife's birthday?
Sentence (from "Per Mathisen"): Per Mathisen (born 7 October 1969 in Sandefjord, Norway) is a Norwegian jazz musician (upright bass and guitar bass) and composer, known from collaborations with great jazz musicians like Terri Lyne Carrington, Geri Allen, Gary Thomas, Bill Bruford, Alex Acuña, Gary Husband, Ralph Peterson, Nguyen Le and Terje Rypdal.
Relevant evidence: No