Cocktail hour music is one of the details that the bride and groom don't feel the need to micromanage. Typically when the bride and groom are asked for music choices, they say to just play classical music. Beyond that, they've got nothing! If you're looking for basic piano music, look to a local college with a reputable music program. Contact the head of the music department or a professor and ask for a student recommendation. This will cost far less than having your band or DJ play for cocktail hour.