Listen to You're Just in Love, I Wonder Why online. You're Just in Love, I Wonder Why is an English language song and is sung by Ethel Merman and Donald O'connor. You're Just in Love, I Wonder Why, from the album 100 Hits Vintage Nº2, was released in the year 2013. The duration of the song is 2:52. Download English songs online from JioSaavn.