
Originally Posted by
Sara Hood
I would have thought that cold room/cold horn == sharp pitch because metal contracts/gets smaller in the cold. And the opposite, hot room/hot horn == flat pitch because it gets larger when warm/hot. Generally speaking in music, smaller = higher pitch. Please correct me if I am wrong here. I would love a layman's explanation of the physics of this.
- Sara
There can be a small (very small) pitch change on a brass horn contracting and expanding as you think, but this is almost negligible. Particularly when compared to the effect of cold vs. warm air. rgorscak, in a post above, has a link to a good technical read on this.
It is very useful and important to know that when your horn is cold, it is flat as compared to when it is warmed up. This relates to a pet peeve of mine, which is, the tuning of your instrument, often with the band's or orchestra's oboe at the start of rehearsal or performance. My peeve is when folks show up 30 seconds prior to this tuning event without having played one note on their horn, and then expect to be able to tune up properly. As you warmup and play, your horn will (typically) go sharper. Of course, if you just brought your horn into an air-conditioned rehearsal room after having it sit out of the case in the back seat of your car in the Arizona sun in summer, then the opposite effect may occur as you warm up and your horn acclimates to the room.
John Morgan
The U.S. Army Band (Pershing's Own) 1971-1976
Adams E3 Custom Series Euphonium, Wessex EP-100 Dolce Euphonium, 1956 B&H Imperial Euphonium
Adams TB1 Tenor Trombone, Yamaha YBL-822G Bass Trombone
Kingdom of the Sun (KOS) Concert Band, Ocala, FL (Euphonium)
KOS Brass Quintet (Trombone, Euphonium)
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