Unaccompanied Viola Piece for Wedding?

Hi, I am getting married in November and am looking for a piece to play. My fianc�e loves listening to me play my viola, although I do not do it for him very often. For our vows, I would like to have the vows displayed on a power point (via the projector our venue has) and play a beautiful viola piece as it is being displayed. I want something that is, as stated, unaccompanied. I would also prefer a slower piece (possible slow-moderate.) I am currently looking on multiple music sheet/music score sights, but would like some insight as well. Thank you for your help!