Tex and Rex are identical and inseparable twins who remain cowboys at heart. They are the main guitarists for the Jukebox Band, noted for playing a single guitar with Rex doing the strumming and rarely playing the harmonica, and Tex handling the notes and chords on the fret.
- Season 1 - A Place Unlike Any Other, Does It Bite?, And the Band Played Off, Pitching In and Helping Out, Show and Yell, Faith, Hope and Anxiety, Agree to Disagree, Whistle While You Work, Two Old Hands, Happy Accidents, Ring in the Old, Impractical Jokes, Finders Keepers, Just Wild About Harry's Workshop, Promises, Promises, Word's Out, Too Many Cooks, Mapping it Out, Things that Go Ga-Hooga in the Night, Is This the End? and 'Tis A Gift
- Season 2 - Scare Dares, Oh, What A Tangled Web, The Magic is Believing, Win, Lose or Draw, Sweet and Sour, Achoo, A Dog's Life, Field Day, Wrong Track, Washout, Crackpot, Yabba, Yabba, Yabba, Nickel in a Pickle, Stop the Press, He Loves Me, He Loves Me Not, Double Trouble, Is Anybody There?, Do I Hear, Jingle, Jingle, Jingle and All's Fair
- Season 3 - Becky Makes a Wish, Schemer's Alone, Bully for Mr. Conductor, Stacy Cleans Up, Schemer's Robot, Billy Saves the Day, Billy's Party, Fortune Teller Schemer, Billy's Runaway Train, Schemer Goes Camping, Mr. Conductor's Evil Twin, Bad Luck Day at Shining Time Station, Mr. Conductor's Fourth of July, Stacy Forgets Her Name, Schemer's Special Club, Mr. Conductor's Movie, The Joke's on Schemer, Dance Crazy, Mysterious Stranger, Dan's Big Race, Mr. Conductor Gets Left Out, Mr. Conductor's Big Sleepwalk, The Mayor Runs for Re-Election, Stacy Says No and How the Station Got Its Name
- The Family Specials - Once Upon a Time, Second Chances, One of the Family and Queen for a Day
- The Jukebox Band (series) - A Day in the Life of The Jukebox Band, A Jukebox Lullaby and Tribute to JJ Silvers
- Other - Birthday Party Singsongs (voice only)
- Craig Marin (entire series)
- In the episode Sweet and Sour, Rex and Tex say that their first job was in a bank's radio.
- They also had a job in a music box with a cowgirl ballerina as seen in the episode Billy's Runaway Train.