I love Feist and have been following her for years now. She used to be much more shy when she first started touring with other members of the Broken Social Scene. She seems far more comfortable now so I agree, some of what comes of as extroversion is learned and practiced. She's likely more of an introvert by inclination. I'm with you on the INF, why J though? She's so great with improvisation. Every time she sings a song in public, it's different. She seems to really go with the flow.