Funny you should mention this today because we just sent our song list to our wc Itzel tonight! We are also having a guitar.
You get 4 song choices. One for the wedding party entrance, one for the bride entrance, one for the certificate signing, and one for the end of the ceremony.
Classic options are (copied directly from her email to me, so not sure if spelling is correct):
Cannon in D
Trumpet Voluntary in D
Here Comes the Bride
Babbino Carro (Pucchini)
Aria in D (Bach)
Somewhere Over The Rainbow
Fly Me To The Moon
My Heart Will Go On
Without You (Mariah Carey)
We didn't really like any of those options but she said with enough time the musician can learn any song you may chose (our wedding is 13 weeks away) so we got on YouTube and found 4 pop songs that we loved when played with an acoustic guitar and just sent her the list (Bruno Mars, Jason Mraz, etc) She did mention that he recently performed a Bruno Mars and Bee Gees song at a wedding so I'm sure he has some that he knows outside of this list.
Go onto Youtube and search for ambonick1 ... he posts some great acoustic guitar songs and will give you some ideas, even if it is coming up quick!
And children are not included in your list of guests unless they eat off the adult menu (what I was told). They have a kids menu for them.
Have a wonderful wedding!!!