There is a moment in Bruce Broder’s delightfully engaging documentary film Chops (2007) when T.J., a very talented young trombonist, asks famed trumpeter Wynton Marsalis the difference between the sound of church in one’s horn playing and the sound of soulfulness. Marsalis offers a great response:
O.K., this is the difference between soulfulness and church. Soulfulness is something that everybody has. Soulfulness is the feeling that when I am around you, I don’t want to leave. That’s soulfulness. You walk into somebody’s house, man you want to sit down there forever […] And that’s a part of our music, the down home, the soulful, the warm, the inviting. Sometimes church is that, sometimes it [ain't].
I watched Chops on Netflix last night -- definitely worth watching if you love jazz.