My family has always been huge fans of Enya, so pretty much the whole ceremony will have Enya music playing.

As people are seating: Watermark, The Memory of Trees
Processional:  Shepard Moon
Bride Entrance/walk: A Day Without Rain
Recessional: Possibly Wild Child by Enya

Introductions: TBD (Though I love "Say Hey" by Spearhead...but with 6 months to go, it may get old).
Bride and Groom Dance: Transformation by David Gray
Bride and Father: Forever Young by Rod Stewart
Groom and Mom: You're the Best Thing by Gladys Knight and the Pips