High fidelity made great advances during the 1970s, as turntables became very precise instruments with belt or direct drive, jewel-balanced tonearms, some with electronically controlled linear tracking and magnetic cartridges. A well-maintained record would have very little surface noise, though it was difficult to keep records completely free from scratches, which produced popping noises. Another characteristic failure mode was groove lock, causing a section of music to repeat, separated by a popping noise. This was so common that a saying was coined: you sound like a broken record, referring to someone who is being annoyingly repetitious.