@Matebu
For many reasons, the compositions were very lush with beautiful melodies and great chord progression. Plus, the chorus had excellent harmonies and the lyrics came from the heart rather than bedroom talk.
It's through Tcha-Tcho style that Koffi is best comfortable as an artist and where we got talent like Willy Bula, Fally, and Sam Tshintu among others.
Those albums are still played today, while his recent material are popular for some months and quickly forgotten with the exception of his generiques