This idiom is used to describe unforgettably beautiful singing.

这个成语就形容歌声的美丽与令人难忘。

youdao

A combination of light, caramel and Bavarian malt creates an unforgettably bright color and body for these beers.

它结合了清淡味，焦糖味，及巴伐利亚焦香麦芽味一起来创造一种令人难忘的明亮的颜色及酒体。

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Throughout the book, Dr. Epstein paints an unforgettably nuanced portrait of Western efforts in Africa: well-meaning, vitally necessary and yet often so misguided.

在整个书中，爱泼斯坦博士描绘了一个令人难忘的细致入微的在非洲的西方人努力的形象：善意的，极为必要的，但常常被误导的。

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You may or may not like Wilder's answer, but he poses the question unforgettably.

NPR: The Least Material of Material Gifts

Mr. Parrish gave my guys an unforgettably positive impression of this multi-billion dollar global financial services company.

FORBES: How Small Gestures Lead to Big Success

You arrived here already with an impressive record of answering our needs, particularly -- and unforgettably -- in the domain of security.

WHITEHOUSE: The White House