〜たびに
every time, whenever
Verb dictionary form / Noun + の + たびに
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たびに means "every time": この歌を聞くたびに、高校時代を思い出す, "every time I hear this song, I remember my high-school days".
After a verb it follows the dictionary form; after a noun it takes の: 旅行のたびに, "every time I travel".
The second part is something that happens or changes each time, often a feeling or a habit. It stresses repetition more than とき or と, which could describe a single occasion.
Compare ごとに, "every" for regular units (every station, every hour, every season). たびに is for occasions, whenever they happen: meetings, trips, phone calls, moves.
Examples
この歌を聞くたびに、高校時代を思い出す。
Every time I hear this song, I remember my high-school days.
会うたびに、彼女はきれいになる。
Every time I see her, she looks more beautiful.
旅行のたびに、お土産を買ってくる。
I bring back souvenirs every time I travel.
引っ越すたびに、物が増える。
Every time I move house, I end up with more stuff.
父は電話するたびに、同じことを聞く。
My father asks the same thing every time he calls.