at the top of one's lungs

Prepositional phrase

idiomatic

(idiomatic) Very loudly; as loudly as (vocally) possible.

Japanese Meaning

可能な限り大きな声で、全力で声を出して叫ぶこと / 最高の声量で、声を絞って叫ぶ様子

When one sings at the top of one's lungs, it's hard to keep a steady pitch.

人が声を張り上げて歌うと、音程を安定させるのは難しい。

Sense（1）

(idiomatic) Very loudly; as loudly as (vocally) possible.

Wolfman Jack, he's speaking in tongues

He's going on and on at the top of his lungs