I think you mean Pete Coe.

Chris is his ex-wife who plays hammered dulcimer and duet concertina
but, I can assure you, not melodeon.

JK is my favourite everything (almost) but the list of top melodeon
players has to include

Andy Cutting
Tony Hall
Simon Ritchie

Anahata
(that last names's not supposed to be part of the list, I wouldn't vote for myself)