The repeating melodic and rhythmic bass pattern, distinct from the kick, that locks a track's low-end groove and often defines its genre.
The bassline is the melodic and rhythmic bass instrument pattern that runs beneath the drums, typically a synthesizer or sampled bass playing notes that follow the harmonic progression. It occupies the upper part of the low-frequency range and gives a track its harmonic identity in the low end.
Why it matters
Two basslines playing together almost always clash harmonically and create frequency buildup. Most transitions require cutting or filtering one bassline before bringing in the other.
