if and only if?

say it's only a paper moon, sailing over a cardboard sea....yes its only a canvass sky, hanging over a muslin tree. but it wouldn't be make-believe, if you believed in me.... How happy i would be if you believed in me - ella f, (it's only a) papermoon. Lady sings the blues, vol. 2 (thanks to lyh & her lovey and joanna wendy)