Covers:

1944:

Guy Lombardo [top 5 US as Speak Low (When You Speak, Love); vocal: Billy Leach]

1944:

Judy Garland

1948:

Dick Haymes & Eileen Wilson [in film version; Eileen dubbing for Ava Gardner]

1953:

Kurt Weill [on lp Tryout; probably the demo]

1956:

Billie Holiday

1957:

Jane Morgan

1958:

Sarah Vaughan

1958:

Lena Horne

1960:

Tony Bennett

1961:

Al Caiola

1965:

Andy Williams

1966:

Sammy Davis Jr.

1970:

Frank Sinatra [sang it for radio since '44]

1983:

Ella Fitzgerald & Joe Pass [on lp Speak Love]

1988:

Marisa Monte

1993:

Barbra Streisand

2002:

Ute Lemper

2008:

Boz Scaggs [title track cd]

2017:

Eliane Elias