Big beat is a genre of music that typically uses heavy breakbeats and synthesizer-generated loops and patterns common to techno and acid house. Big beat tends to feature distorted, compressed breakbeats at tempos between 120 to 140 beats per minute, TB-303 synthesizer lines, and heavy loops from 60s and 70s funk, jazz, rock, and pop songs. They are often driven by intense, distorted guitar-style synthesizer basslines with conventional pop and techno song structures. Big beat tracks have a sound that includes crescendos, builds, drops, extended drum rolls and dramatic sound effects, such as explosions, air horns, or sirens. The use of effects such as filters, phasing, and flanging is commonplace.