The accident took place on Tuesday at Pallipuram on the outskirts of the capital city when the couple was driving back from Thrissur after visiting temples.
Their two-year-old child, who died in the crash, was cremated here on Thursday.
The musician's wife and the driver were recovering, according to the doctor.
Since the accident, video clips of his performances were being shared on social media by his fans.
The musician shot to fame when, as a 17-year-old, he composed music for a Malayalam film and has scored music for several films.