Wild gorillas compose songs that they hum during meals
I've always hypothesized that humming while eatting (or saying "Mmmmm") is the perfect pitch to vibrate the hummer's tounge, which makes the flavors experienced more pronounced.<p>It would explain why we say "Mmmmm" not something higher pitched.  Plus you can feel your tounge moving when you say "Mmmmm".<p>Any thoughts?