When he died in 1943, Harlem-born Thomas “Fats” Waller had taken all he’d learned from his mentor, the ragtime-stride pianist James P. Johnson, and established a reputation as an instrumentalist/songwriter/performer that dwarfed Johnson’s, casting a long shadow over subsequent keyboard giants, including Erroll Garner, Count Basie, and Art Tatum. Though Waller’s first recordings brought stride piano into the …