"I Wonder Why" is a song by American singer and songwriter Curtis Stigers, released as the first single from his eponymous debut album on August 12, 1991, in the United States.

The song reached number four on the Danish and Irish singles charts, number five on the UK Singles Chart, and number nine on the US Billboard Hot 100.

It also reached the top 10 in Belgium, Denmark, Germany, the Netherlands, and Norway.

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