The drill song discovered on Nehemie Tampwo’s mobile featured the name “Kaysab” which was a nickname for 15-year-old Keelan, Wolverhampton Crown Court was told.
The rappers also spoke about “stabbing and killing” people and bragged about being in a “violent gang”, said PC William Bolton-Betts.
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Tampwo, of Fern Grove, Bletchley, is one of four 19-year-old men accused of murdering the teenager just yards from his home, in Strathfield Walk, Merry Hill, Wolverhampton, on May 29, 2018.
Police discovered the song, called “Tz X TeeLoo... uh Duh”, on Tampwo’s phone on August 20, 2018 – almost three months after Keelan’s death, jurors were told.
It is believed two or three different speakers featured on the rap song but their identities, or when the track was made, remains unclear.
PC Bolton-Betts, who listened to similar music growing up, appeared as an expert witness for the prosecution, where he helped to decipher the lyrics in the song.
Tampwo denies murder, alongside fellow defendants: Brian Sasa, of Long Ley, Heath Town; Tyrique King, of Chelwood Gardens, Bilston; and Zennay Pennant-Phillips, whose address cannot be published for legal reasons.
The trial continues.