Dalhart was an eclectic urban singer who recorded whatever might sell: comic songs (sometimes featuring the sprightly tenor banjo of John Cali), Hawaiian pieces, sentimental numbers, and much more. When he turned to country music it may have been simply a way of capitalizing on a song type that his competitors had neglected, but he immediately showed a flair for story songs. He tightened his operatic voice slightly, producing a distinctive, reedy vibrato that signaled his rural roots but appealed to mainstream record buyers. After "The Wreck of the Old 97" became a smash hit, Dalhart was a national star of sorts -- he was never a really recognizable figure, but he could sell records in the millions. During the '20s and '30s, he used over 100 pseudonyms to record over 5,000 78 rpm singles for a variety of labels; among the names he adopted were Frank Evans, Vernon Dale, Tobe Little, Bob White, Hugh Lattimer, Sid Turner, and Al Craver. Dalhart scored successes with a series of topical songs based on current events such as the death of a Kentucky spelunker and the notorious Scopes trial, selling enough copies to firmly establish the Columbia label's 15,000-numbered country series as a force in the industry. He was often teamed with guitarist and songwriter Carson Robison, who composed some of his material and went on to a long career of his own. Dalhart continued on with recording through the late '30s, at which time his rather formal interpretation of down-home music fell out of favor as record buyers became more familiar with "authentic" country singers such as the Carter Family and turned to hip new genres such as Western swing.

Dalhart, despite persistent efforts to interest record labels in his work, was largely forgotten later in life. In the 1940s he eked out a living giving voice lessons and working as a night watchman in Bridgeport, CT, realizing no royalties from his earlier million-sellers. He died of heart failure in 1948. One of the achievements of the first stirrings of country music scholarship in the 1960s and 1970s was a new appreciation of his importance, and in 1981 Dalhart's contribution was finally given its due recognition when he was inducted into the Country Music Hall of Fame.