I will share an interesting instance involving kavignar :P
kavignar agreed to pen the lyrics for 'avanthaan manithan' and the producers requested kavingnar to pen the lyrics immediately as the shooting was scheduled in May 1973. They kept on reminding the shooting schedule is in May but kavignar as usual was taking it lightly. One fine day they insisted that he gives the lyrics for the songs then and there only as it was already last week of April and shooting is to start in May.
Kavignar was not too pleased but he wrote the lyrics for all the songs in one stroke and gave it to MSV. After handing over the lyrics and before leaving, kavignar told the producers and MSV to take extra care of one particular song as it reflects the mood of the producers. They tried to decipher which song was that but weren't able find anything common to their mood and any of the songs.
Finally MSV realised what kavignar meant while re-recording the song and it was "anbu nadamaadum kalai koodame". Every line in the song ends with 'may', 'koodame', 'megame', 'vanname' and so on. kavignar got so pissed off with verbal reminders by the producers and emphasising about the shooting schedule in Singapore in the month of May. That was the prize for incurring kavignar's wrath :P The producers, MSV and troup had a good laugh.
That film also had other songs such as "aattuviththaal yaar oruvan", "manithan ninaipathundu". All these songs were written in one flow and under couple of hours. A genius beyond comparison :bow: