"More Than You Know" is a popular song and jazz-standard.
The music was written by Vincent Youmans, the lyrics by Billy Rose and Edward Eliscu. The song was published in 1929.

The song was introduced in the Broadway musical Great Day where it was sung by Mayo Methot. It was also popularized on the stage and radio by Jane Froman. The most popular contemporary recordings were by Helen Morgan (Victor catalog number 22149), and by Libby Holman (Brunswick catalog number 4613). It was subsequently included in two musical films: Hit the Deck (1955), sung by Tony Martin, and Funny Lady (1975), sung by Barbra Streisand. It has been recorded by many artists, including Star Trek Next Generation's Brent Spiner on his 1991 album 'Ol' Yellow Eyes Is Back'.

Далее перечислены более 100 имён певиц и певцов, исполнявших этот джаз-стандарт
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http://en.wikipedia.org/wiki/More_Than_You_Know_(1929_song)
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Whether you are here or yonder, whether you are false or true
Whether you remain or wander, I'm growing fonder of you
Even though your friends forsake you, even though you don't succeed
Wouldn't I be glad to take you, give you the break you need

More than you know, more than you know
Girl of my heart, I love you so
Lately I find you're on my mind
More than you know

Whether you're right, whether you're wrong
Girl of my heart, I'll string along
You need me so
Much more than you'll ever know (ever know)

Loving you the way that I do
There's nothing I can do about it
Loving may be all you can give
But baby I can't live without it

Oh, how I'd cry, oh, how I'd cry
If you got tired and said "Good-bye"
More than I'd show
More than you'd ever know