Actually, in the 1992 version of The American Heritage Dictionary, the first definition of Wax2 (the verb, not the oily stuff) is: "To increase gradually in size, number, strength, or intensity". The moon waxing is given as the second definition, and the third definition is: "To grow or become as specified" and the example given is a quote from John Simon: "could afford . . . to wax sentimental over their heritage."

So, it's not that an archaic a meaning...

Okay -- a headline for my song-to-be? How about:

"Songs and Love are both stronger than they appear."