How many grooves are on one side of an LP record?
LP record vertically on a spindle. This arrangement encouraged the production of multiple-record sets in automatic sequence. A two-record set had Side 1 and Side 4 on one record, and Side 2 and Side 3 on the other, so the first two sides could play in a changer without the listener's intervention. Then the stack was flipped over. Larger boxed sets used appropriate automatic sequencing (1–8, 2–7, 3–6, 4–5) to allow continuous playback, but this created difficulties when searching for an individual track. Vinyl records are vulnerable to dust, heat warping, scuffs and scratches. Dust in the groove is usually heard as
LP record 45-minute playing time. A small number of albums exceeded the 52-minute limit. But these records had to be cut with much narrower spacing between the grooves, which allowed for a much smaller amount of dynamic range on the records, and meant that playing the record with a worn needle could damage the record. It also resulted in a much quieter sound. The list of long-playing vinyl records includes the 90-minute 1976 LP "90 Minutes with Arthur Fiedler and the Boston Pops", made by Radio Shack; Genesis' "Duke", with each side exceeding 27 minutes; Bob Dylan's 1976 album "Desire", with side