"Whoknows" is the second and last single from Musiq Soulchild's third album Soulstar. It was released as an airplay-only single in January, 2004.

It debuted on the Billboard

Billboard (magazine)

Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...

Hot R&B/Hip-Hop Songs

Hot R&B/Hip-Hop Songs

Hot R&B/Hip-Hop Songs, is a chart released weekly by Billboard in the United States.The chart, initiated in 1942, is used to track the success of popular music songs in urban, or primarily African American, venues. Dominated over the years at various times by jazz, rhythm and blues, doo-wop, soul,...

 chart on January 31, 2004, spent 24 weeks on the chart (its last being July 10, 2004) and peaked at #23.

"Whoknows" entered the Billboard Hot 100

Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...

on April 24, 2004, spending 13 weeks there, peaking at #65 and falling off on July 10, 2004.