When one thinks of music for an anniversary, one will most often think of a couple’s "song." Because music creates such a powerful emotional response in those who listen to it, couples will often find that there is a song or songs that they associate with one another and their coupling. For one couple death metal might be intimately associated with their having come together, for another couple it might be an oldie or even a piece of classical music.
While “the song” is important when it comes to anniversary music, it is not the only piece of music that’s appropriate for the occasion. Often a couple will choose to spend an intimate day, night or both with each other. For these occasions, they will necessarily want music that’s appropriate for an intimate time.
For this reason, music for an anniversary is typically light on lyrical content – if there is any at all – and it will be romantic or contemplative in nature. Music that has these qualities will typically be mid-tempo or slower, and it will be of a lower volume. Also, such music will most often be of a lower volume. For this reason, oldies are particularly popular for couples that are celebrating their anniversaries.
All of that being said, what one couple finds romantic will be as particular as the romance that is shared between that couple. Ultimately, the music will be that which reminds each half of the couple of the other. Because of music’s particular effect on different individuals, it is impossible to predict what any given couple will or will not find romantic.