'Are You That Somebody?' was a commercial success, reaching number 21 on the US Billboard Hot 100, number 11 in the United Kingdom, number three in the Netherlands, and number one in New Zealand. The song samples the sound of a baby cooing from producer Jac Holzman's 1964 track 'Happy Baby' from Authentic Sound Effects Volume 8 (later used in Perrey and Kingsley's 1966 hit 'Countdown at 6' off The In Sound from Way Out!) pop radio stations on Septem(see 1998 in music). The song was co-written and composed by Static Major, who also sang backing vocals, and Timbaland, who, in addition to writing the song, produced and performed a guest rap for it. ' Are You That Somebody?' is a song by American R&B recording artist Aaliyah, recorded for the Dr.