調
KanjiJLPT N4
Tune

tune, tone, meter, key (music), writing style, prepare, exorcise, investigate, harmonize, mediate

Mnemonic

You scream words into a vast canyon, and they travel the entire circumference of the valley walls. When the echo returns perfectly harmonized, you know you've found the right tune—every word resonating in flawless alignment around the circumference.
Additional thoughts
Picture standing in a circular canyon, shouting and listening as your voice wraps all the way around. The purity of the returning echo tells you whether everything is in tune. Words + Circumference = checking harmony.
Quick recall
Words echoing around the full circumference of a canyon reveal the perfect tune.

Details

The keyword for 調 is tune. This kanji conveys the idea of harmonizing, adjusting, or investigating something to bring it into proper order or alignment. It encompasses meanings related to melody and musical tuning, as well as the broader sense of examining, researching, or regulating things so they function smoothly. It can also refer to tone, mood, or the general condition of something, reflecting the idea of everything being in proper balance.
On'yomi
ちょう
Kun'yomi
しら.べる、しら.べ、ととの.う、ととの.える