First recorded by Bob Crosby with Marion Mann (1940).
Hit versions by Tommy Dorsey & His Orchestra (US #17 1940), Tony Martin (US #16 1940), The Glenn Miller Orchestra (US #1 1940), Billy Eckstine (R&B #6 1949), Brook Benton (US #24/R&B #5 1960), Etta James (US #87 1962), Ricky Nelson (US #12/R&B #24/UK #12 1963).
From the wiki: “‘Fools Rush In’ was written in 1940 by lyricist Johnny Mercer with music by Rube Bloom. First recorded by the Bob Crosby orchestra with Marion Mann, major hits at the time of introduction were recorded by Tony Martin, Glenn Miller with Ray Eberle, and Tommy Dorsey with Frank Sinatra. It was also recorded by Billy Eckstine. In the 1960s, ‘Fools Rush In’ saw a resurgence of popularity, resulting in charted remakes in 1960-61 (Brook Benton), 1962 (Etta James), and 1963 (Ricky Nelson).”