Both songs are really played by Japonais. When Japonais stayed in Europe after having played for Wenge 4x4, he became a session-player. His reputation started to grow more after playing for Aime Buanga in Engombi and Emeneya's Succes Fous. That's why Awilo asked him to play for his album Coupe Bibamba, knowing him already since the 80s where he used to play for Tazz Junior. Awilo liked his way of playing and when he started recording his 3th album Kafou Kafou, he waited for Japonais to come back in Europe to also participate. If you buy both albums, you can see Japonais' name credited on it.
Japonais is one of Awilo's favorite solists. He participate in almost every Awilo album. He also played Karolina for Awilo and played some sebenes in Superman. Awilo went last year to Kinshasa just to let Japonais participate in his single Sapeur Pompier.