The phrase "bass passage" refers to a section of music that primarily features the bass instrument or voice. Synonyms for this term could include "bassline," "low notes section," "bass-heavy portion," or "bottom end segment." Other phrases that might convey a similar meaning include "bass solo," "subwoofer section," or "deep-seated rhythm." These terms all relate to the important role that the bass plays in providing the foundation and structure for many types of music. Whether in a jazz ensemble or a rock band, a strong bass passage can anchor the entire piece and give it a sense of stability and groove.