Gloria Estefan & 'N-Sync "Music of My Heart"

Adult Contemporary stalwart Gloria Estefan teamed up with (arguably) the hottest boy band at the close of the 20th Century to record the radio-friendly ballad "Music of My Heart". Pulled from the soundtrack of the movie with the same name, the song found a home all across the radio dial. The wildly successful tune snagged two Grammy nominations, an Academy Award nomination and peaked at #2 on the Hot 100 and Adult Contemporary Charts in 1999.

*N-Sync "(God Must've Spent) A Little More Time on You"

If you went out and bought the CD single to *N-Sync's "(God Must've Spent) A Little More Time on You", you also received quite a smooth little treat: the single's B-side was a live cover of "Sailing" from Christopher Cross.

N-Sync - "This I Promise You"

Adult Contemporary radio stations weren't left out of the boy band craze at the turn of the 20th Century.  AC-friendly ballads such as "This I Promise You" dominated the format.  How did that happen?  Well, the song was written by friend of the format Richard Marx who knew a thing or three about how to create a #1 hit on Adult Contemporary radio.

Boyzone - "No Matter What"

The boy band craze was in full swing during the final year of the 1990s.  The Backstreet Boys, 'N-Sync, and even O-Town dominated the "boy band" bracket of Top 40 radio,  Meanwhile an Irish boy band called Boyzone also found their five minutes of fame.  Their ballad "No Matter What" was a tepid Adult Contemporary hit while finding huge international success.