I am pleased to report that Bill and Ted are still excellent. Bill and Ted Face the Music is the third in the series, 31 years after the original “Bill and Ted’s Excellent Adventure,” where the two dim but sweet-natured would-be rockers from San Dimas managed to pass their high school history class by traveling through time in a telephone booth. They also learned that their destiny was to create a song that would unite the world. Two years later, in “Bill and Ted’s Bogus Journey,” their adventures continued, including a visit to hell and a “Seventh Seal”-inspired encounter with Death. Much of the core cast of the original films returned, including Alex Winter (who also produced) as Bill, Keanu Reeves as Ted, William Sadler as Death, Hal London, Jr. as Ted’s stern father, and Amy Stoch as Missy, who was in high school with Bill and Ted but in the first film is married to Bill’s father.

In the present day, Bill and Ted are married to the medieval princesses who traveled through time with them in the earlier films, now played by Erinn Hayes and Jayma Mays. Things are not going well. Bill and Ted still perform as the Wyld Stallyns, but not in arenas. Their current gig is at Missy’s latest wedding, to Ted’s younger brother Deacon (“SNL’s” Beck Bennett). Their performance of a song named something like “That Which Binds Us Through Time, The Chemical, Physical and Biological Nature of Love,” combines some of the strangest sounds known to music, even stranger in combination guttural throat singing, bagpipes, and a theramin is, at best mystifying to the wedding guests. Basically, they hate it. Their wives insist on marriage counseling (with the always-great Jillian Bell) and we get a sense of the problem when the guys cannot understand why “couples counseling” might not mean both couples at the same time.

Each couple has a daughter. Ted’s daughter is Billie (Brigette Lundy-Paine) and Bill’s is Thea (Samara Weaving, the niece of Hugo Weaving who was Reeves’ nemesis in the “Matrix” films). The girls are 24, still living at home, and spend all day listening to music. In other words, they take after their dads.

Bill and Ted are beginning to question whether they should just give up their music. But then Kelly (Kristen Schall) shows up in a futuristic, egg-shaped time traveling capsule. That song that was going to unite the world — they would have to produce and perform it that night or it would be the end of everything. “The Great Turntable is Tipping. Reality will collapse and time and space will cease to exist.”

Everyone ends up getting involved. The guys go forward in time to see if they can get the song from various future selves. (Boy, the people in charge of hair had some fun with that.) The princesses/wives explore the multiverse to see if there’s a happier ending. And Billie and Thea do what Bill and Ted did in the first film; they go back in history and pick up some help.

Some viewers will need to be brought up to date on the earlier films, as there are references that will delight the fans. Some younger viewers will need a history lesson about phone booths. (Of course Bill and Ted do their time traveling old school.) And some fans of the original many need to check with a younger member of the family to learn who Kid Cudi is. I hope all ages know who Dave Grohl is.

It’s all sweet, silly fun, with a conclusion that is likely to bring some tearing up from the parents in the audience, and make all Bill and Ted fans feel that this has been a very excellent adventure for us all.

Parents should know there is some mild language and some mostly comic peril and violence, including characters who are temporarily “killed” and sent to Hell.

Family discussion: Would you want to meet the future versions of yourself? What would you want to know?

If you like this, try: the two earlier “Bill and Ted” movies and the San Diego Comic-Con panel about the movie.