Name and lyrics to song in Sleepless in Seattle.?

Question

Scene where the old boyfriend is with Meg & her friends for a holiday and they are singing. The stanza the boyfriend is supposed to sings is “The horn, the horn is so forlorn” which Meg helps him to sing. Another is ” the clarinet, the clarinet…”. The song is about musical instruments. If anyone knows the answer please let me know. Thanks!

Answer 1

Google brought me to this page: Hope it's what you're looking for. Q: I'm trying to find the name of the song that Meg Ryan sings in the little choir group - it goes along the lines of "...the horn, the horn, it sounds so forlorn. The clarinet, the clarinet, goes..."
A: It's an Austrian folk song known as "The Instrument Song" or "The Orchestra Song." Here are typical verses, which vary a bit from what is sung in You've Got Mail:

The violins ringing like lovely singing.
The violins ringing like lovely song.

The clarinet, the clarinet, goes doodle doodle doodle dat.
The clarinet, the clarinet, goes doodle doodle doodle dat.

The trumpet is braying, Ta ta ta ta ta ta ta ta ta ta ta ta ta ta ta ta ta.
The horn, the horn, awakes me at morn.
The horn, the horn, awakes me at morn.

The drums playing two tones.
They're always the same tones.
The drums playing two tones.
They're always the same

Answer 2

It's called, "The Orchestra Song", and it dates back to 1946 as an old German folk song. It's taken from "Humor in Music, by Julius Herford. Here is a link to the sheet music on it:
http://www.dsokids.com/2001/dso.asp?PageID=416