One of the best songs from the year 1990. Hold On is one of Wilson Phillips' first singles, released with a first-rate music video that inspired girls (and gays) to attempt to sing in three-part harmony. That year, I was in seventh grade, and printed vests over button-downs were fab (see Chynna Phillips in the video). I'd never heard anything like Wilson Phillips before then, and was instantly enthralled.
Coming to think of it, I don't think I've heard anyone like them ever.