Music that Boomers would listen to and/or write themselves. Picturing a 35-50 year old dance to these tracks puts your stomach in a knot. Inherently uncool. However, some very good bands today write embarrasing Dad Rock tracks.
They also tend to have long titles.
U2 - Stuck In A Moment..., Sometimes You Can't Make It..., Coldplay - God Put A Smile..., A Rush Of Blood, Oasis - Little By Little, Where Did It All Go Wrong?