Thanks。 以下ページに抜粋ｍｐ3ファイル有り。
アメリカ国歌歌詞を見ながらｍｐ3ファイルを３回聴いたら納得できた。
http://bopuc.levendis.com/weblog/archives/-2005/10/10/1955_glenn_gould_remixes_live_on_piano.php

His explanation is as interesting as the performance of it:

（ＧＧ）"I figured out that by leaving out the repeats in The Star Spangled Banner and starting your entry at the 13th bar of God Save The King,
and then playing God Save The King over again and altering the harmony of the second half of The King to modulate to the supertonic region, it has the most marvelous effect. Listen to this..."

One of the things Gould's 1955 Goldberg variations recording is famous for is the fact that Gould mumbles and hums his way though it, and he *insisted* on leaving them in the final product.
These could be interpreted as personal scribbles or what not. Or subvocalization; something we do when we need to glue several layers of complex data together.

＞ he *insisted* on leaving them in the final product.
これは違うだろ。 真実は：「歌声（鼻歌）の音量が大きすぎて排除不可能だった」はず。

別の話題：「ＧＧはレガートしない」というのが万人一致する見解らしいが、実感できない。
ＧＧでもレガートすることがあるのか？ あるなら実例きぼん。
バッハ弾く時に特にノン・レガートになるのか？