Singing for weddings

Today I tried to take a nap on the couch. It didn't last too long. I awoke to a random melody being belted out in the back bedroom.
"Amy," I shouted. "What are you doing?"
"Oh, I'm just singing at somebody's wedding!" Came the nonchalant reply.
"Who's wedding?" I asked. We've had quite a few friends get married so thought maybe she was pretending to sing for one of them.
There was a long pause as she thought about it.
"Tree and stick," she exclaimed happily. "And look mommy, I've made them a PRESENT too! Do you want to help UNwrap it for them?"