 In rap terminology, 16-bars is the amount of time that rappers are generally given to perform a guest verse on another artist's song; one bar is typically equal to four beats of music.Old school flows were relatively basic and used only few syllables per bar, simple rhythmic patterns, and basic rhyming techniques and rhyme schemes.Melle Mel is cited as an MC who epitomizes the old school flow – Kool Moe Dee says, "from 1970 to 1978 we rhymed one way [then] Melle Mel, in 1978, gave us the new cadence we would use from 1978 to 1986".