We all know that music can powerfully affect emotions, changing how you feel completely or intensifying the mood you’re already in. We also know that relationships can powerfully affect emotions, making you want to dance in the streets or hide out under the covers. Listening to the right song at the right moment will amp up your elation, pull you out of a funk, or plunge you deeper into despair. Click through for playlists to help you rejoice in the beginning of a new relationship, mourn the loss of an old one, or give you the strength to move on to the next.