How did it sing while under the gun?

Mine sounds like a high pitched Indy car, but at about 5000 RPM's less. LOL.

Have a habit of going under and checking its condition and for looseness.
Though my miles have been limited this year and last, it still looks fresh and tight.
Would be interesting to make a sound check using 5ive different metals. 625 Inconel, 6AL4V Titanium, 6061 Aluminum, 341 Stainless steel and regular steel.