When I think of Mama Knows Best, to me, that's raw, Joplinesque blues, tho Janis was a very raw singer and woulda likely blown out her vocal cords had she lived into her 30s, whereas Jessie's vocals are more controlled and she does amazing things w/ her voice that I've never heard anybody do b4. As for 'pop' music, I think of that as a cross between folk/show tunes and ballads; u can't dance to them, just listen. Whatever Jessie does, vocally and otherwise, it's always sensational.