Who had the first rap song and what year?

The first rap song is generally considered to be 'Rappers Delight' by the Sugarhill Gang which was released in late 1979. It was however, preceded slightly by 'King Tim III (Personality Jock)' by The Fatback Band.

Another answer:

The first rap song that was ever recorded was 'Kinesiska Muren' With Swedish artist Evert Taube which was recorded in the 1920's. which this video

it appears to be rap about the great wall of china [1]

Another answer:

The first rapper to sign a major record deal was the legendary Kurtis Blow under the management of Russell Simmons. He released his first single titled "Christmas Rappin" January 1, 1979 with Mercury Records.

The Sugarhill Gang's "Rapper's Delight" was the first hip-hop song to see commercial success and reach any sort of music chart. It is generally considered the "first rap song", followed by Queen's "Another One Bites the Dust" and Blondie's "Rapture", though Rapper's Delight influenced much of rap to this day.

Another answer:

The first rapper was Al Jolson in the 30s followed by Jimmy Dean in the 50s with 'Big John'.

The first rap song of the 70s was by Fat Back's "KIng Tim III Personality Jock" in 1979.

The first rap song was "King Tim III" and "Rapper's Delight" was next. Read "The Origin of Rap Music" or listen to "Rapologist Speaks '94" for clarity.

Another answer:

Most believe the first rap song to be "Rapper's Delight" by the sugarhill gang

or "the message " by grandmaster flash and the furious five

However, Rapper's Delight was merely the first rap song to enter the Billboard Top 40. A claim can be made that The Last Poets were the first rap group, and their 1970 piece, "New York, New York" was influential in the subject matter of rap music, as it dealt with the stress of growing up poor and black in New York City during the late 1960s. The background of the piece is a simple hand drum with a repeating chant, "New York, New York, the big out" while the words are spoken in a style that combines the beat poetry of the 1950s and charismatic black church preaching.

James Brown's heavy funk beats would soon enter the rap/hip-hop scene. Brown frequently didn't sing his lyrics, but would shout them rhythmically, as in "The Big Payback." As such, some consider him to be an early proto-rap artist.

The first rap song to hit the top 5 in Billboard was the collaboration between Run-DMC and Aerosmith, "Walk This Way."