1. "Somewhere Over the Rainbow" (1939) by Judy Garland from the movie "The Wizard of Oz."
2. "Tomorrow" (1977) by Annie, played by Aileen Quinn, from the musical film "Annie."
3. "All I Want for Christmas Is You" (1994) by Mariah Carey, features a young girl singing in the background.
4. "Somewhere Out There" (1986) by Linda Ronstadt and James Ingram from the animated movie "An American Tail."
5. "Once Upon a December" (1997) by Deana Carter from the animated movie "Anastasia."
6. "The Rose" (1979) by Amanda McBroom, made popular by Bette Midler, features a little girl singing in the background.
These songs are characterized by the sweet, innocent, and childlike quality of the vocals, which often evoke feelings of nostalgia and sentimentality.