"(It Will Have to Do) Until the Real Thing Comes Along" is a popular song first published in 1936.
According to one version of the original sheet music, the songwriting credits read: "Words and Music by Sammy Cahn, Saul Chaplin and L.E. Freeman".
Another version has, immediately below the title, the words: "with Piano Accordion". According to this version, the songwriting credits read: Words and Music by Mann Holiner, Alberta Nichols, Sammy Cahn, Saul Chaplin and L.E. Freeman.
Otherwise, graphically, the two versions are identical.
ASCAP lists all five as co-writers.
Notable recordings
References
Until the Real Thing Comes Along Wikipedia(Text) CC BY-SA