Question: What kind of early 20th century music were Collins and Harlan known for?

The Harlan House Hotel is a historic building located in Mount Pleasant, Iowa, United States.  It is associated with James Harlan, the first Republican to represent Iowa in the United States Senate (1855-1865, 1867-1872).  He was also Secretary of the Interior (1865-1867).  His daughter Mary was the wife of Robert Todd Lincoln, President Abraham Lincoln's only surviving son.  Harlan built the oldest part of this building as his house in 1857.  After his career as a Senator, he could no longer afford the house and bought another house in Mount Pleasant.  Harlan built the first addition onto his old house and converted it into a hotel so he could support himself.  He added onto the hotel two more time, c. 1880 and 1892.  The first two additions are on the alley side of the building, and the third addition faces Jefferson Street.  The middle section of the building with the bracketed cornice and mansard roof is the original house.  Harlan moved into the hotel in the early 1890s and died here in 1899.  A few minor alterations were made to the building in the 20th century.  It was listed on the National Register of Historic Places in 1987. <SEP> Rockdale, also known as The Robinson/Stirling Place, is a historic home and farm complex located at Fallston, Harford County, Maryland, United States.  It is a farm developed from the late 18th century through the early 20th century.  The dwelling is in three parts.  The east room of the east wing is the earliest section dating from the 18th century.  The largest or main portion of the dwelling dates from between 1815 and 1830.  The north wing, a bay centered in the south façade of the second story, and a small conservatory, date from the very early 20th century.  The main house is five bays in length, two and a half stories, of stone construction, stuccoed and scored.  The home is surrounded by several outbuildings, trees, and other plantings, and the remains of formal gardens and garden structures developed in the early 20th century.  It was the residence of William E. Robinson (1860-1935), an entrepreneur in the local canning industry. <SEP>  They were popular in the United States and the United Kingdom from around 1880 to 1920, though the earliest such songs date from minstrel shows as far back as 1848. Coon songs were a genre of music that presented a stereotyped image of Blacks. <SEP> Collins & Harlan, the team of Arthur Collins and Byron G. Harlan formed a popular comic duet between 1903 and 1926.  Their material also employed many other stereotypes of the time including Irishmen and farmers.  Fellow recording artist Billy Murray nicknamed them "The Half-Ton Duo" as both men were rather overweight.  Collins and Harlan produced many number one hits with recordings of minstrel songs such as "My Gal Irene", "I Know Dat I'll be Happy Til I Die", "Who Do You Love?"  and "Down Among the Sugarcane".  They sang ragtime standards as well as what were known as "Coon songs" – music sung by white performers in a black dialect.  Their song "That Funny Jas Band from Dixieland", recorded November 8, 1916, is among the first recorded uses of the word "jas" which eventually evolved to "jass", and to the current spelling "jazz".