Music like So Solid Crew 21

"21 Seconds" is a song by UK garage crew So Solid Crew. It was released as the second single from the debut album They Don't Know, and was the first of five consecutive top-20 hit singles for the group. It topped the UK Singles Chart in August 2001 and peaked just outside the top 40 in the Netherlands. It achieved first week sales of 118,135 units in the United Kingdom.

In September 2019, NME included the song in their "25 essential UK garage anthems" list.

The song uses fairly stripped back production, utilising a 2-step rhythm which was common in UK garage at the time. Lisa Maffia's young daughter, Chelsea, can be heard at the beginning of the track.

The song title alludes to the approximate 21 seconds that each of the band members is given to perform their rap. 21 seconds is arrived at as the song's tempo is approximately 140BPM and each rapper has 12 bars of 4 beats (48 beats at 140BPM, when worked out to the nearest integer, rounds to 21 seconds). Megaman said the crew created the track after their label told them to make a track lasting three and a half minutes. He said "so we worked out that with at least 10 or 11 members, that’s eight bars each – 21 seconds. It was a simple calculation." Their label manager Shabs Jobanputra said "they literally took a calculator and divided the time by the number of MCs."