KanjiJLPT N1
Chant

chant, recite, call upon, yell

Mnemonic

A mouth opens in a prosperous temple, beginning a sacred chant. The monks believe that when every mouth chants in unison, the community grows more prosperous. Their voices rise, echoing off gilded walls, each chant drawing greater fortune.
Additional thoughts
Prosperous (昌) literally stacks two 日 (sun) radicals—picture double sunlight filling the mouth as it chants, radiating wealth. Mouth + Prosperous = vocal repetition that breeds abundance.
Quick recall
A mouth in a prosperous temple leads a sacred chant.

Details

The keyword for 唱 is chant. This kanji refers to the act of reciting, singing, or calling out words in a rhythmic or melodious manner, much like chanting a prayer or intoning a song. It conveys the idea of vocally leading or advocating something, as well as the repetitive, formal recitation often associated with religious or ceremonial contexts. By extension, it can also mean to advocate or propose an idea publicly.
On'yomi
しょう
Kun'yomi
とな.える