I make 'em up... I heard these two trees one time singing a duet... "Honey, you make my sap rise, come and make sugar with me... Honey, you make my sap rise, come and make sugar with me... you got my xylem and my phloem shootin' straight up to the top of the tree!" (Which is a phenomenon still not completely explained scientifically...)
"Darling you are my sunshine... and my carbon dioxide too...<repeat>
YOu give my chloroplasts a blast, I want to photosynthesize with you!"
"My vacuoles are empty and my cell walls are about to collapse...
But you can make me turgid, send the waters of your love to me fast!"
"I'm pinin' for you darlin', please don't say I'm barkin' up the wrong tree!
We're maple for each other 'cause you always cedar best in me!"

I don't use headphones 'cause then I wouldn't hear these things...
(I have been unsuccessful attempting to use this in courtship myself. It must only work for plants.)

Then there was the one about "I'm stalled out at the traffic light of love..." and the carbon fiber frame song ("I can't wait to straddle that carbon fiber saddle and ride that baby all day long!") - next will be a parody of the bluegrass clasic "Bringing Mary Home" called "Drafting Mary HOme," about a rider who gets dropped and is fighting a headwind at dusk and Mary appears to pull him as far as the Casey's just outside his town... where he stops for Gatorade and they tell him about that rider who disappeared... but every once in a while, when the wind is from the North...

Or it'll be Grateful Dead or STan or Garnet Rogers or any assorted hymns, Utah PHillips, Bruce Cockburn, just depends...