Drum and bass is defined by fast syncopated breakbeats at 165–185 BPM with heavy sub-bass

Drum and bass (D&B or DnB) is a UK electronic dance music genre emerging from the jungle scene in the early 1990s. Its two defining structural elements are: (1) fast, syncopated breakbeats — typically 165–185 BPM — sampled and edited from existing drum recordings; and (2) a deep, heavy sub-bass line, often felt physically through powerful sound systems. Without syncopated breakbeats, a high-tempo 4/4 track is classified as techno or gabber rather than DnB. The genre draws from reggae, dub, hip-hop, breakbeat hardcore, techno, house, funk, jazz, and ambient, and has spawned numerous subgenres spanning liquid and atmospheric to dark industrial styles while maintaining both underground and mainstream global presence.

Examples

Compare a liquid DnB track at 174 BPM (chopped Amen break, heavy sub-bass) versus a techno track at 170 BPM (straight four-on-the-floor kick). The syncopated breakbeat is the essential differentiator.

Assessment

Given unlabelled tracks at 170 BPM, identify which use syncopated breakbeats vs. four-on-the-floor patterns and classify each as DnB or techno. Explain what BPM range alone cannot determine about genre.