I have been practicing music all my conscious life. My father was
basically unmusical but not averse to it. He probably enjoyed that I
enjoyed it. My mother did not show much interest in music except for a
few (about 10-20) singles from the 60s. I played at her 50th, 60th and
70th birthdays and she seemed happy and content with the way it sounded.
I get a pretty high score on the Barcelona Music Reward Questionnaire.
Maybe there is something further back in my family or I'm just a mutant.
What might make me raise my eyebrows in the referenced study is that
there are >9000 twins. According to statistics, there are about 45000
twins aged 37-64. A little more than 20% of all twins of that age in
Sweden participated in the study.
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/bengan