Answer
One O'Clock Jump, Count Basie's first major hit, catapulted him to fame in 1937. This infectious swing tune showcased Basie's signature "Basie groove," characterized by its relaxed, shuffling rhythm and intricate interplay between the piano, saxophone, and trumpet sections. The song's catchy melody and infectious energy made it an instant classic, establishing Basie as a leading figure in the swing era and beyond.