I have been researching many various sites regarding advice for how to properly write lyrics in Japanese.
Some say that you just write what you want; not even syllabic structure is needed.
On the other hand, I've seen documentation speaking meticulously on the specific ways Japanese lyrics should be written. It even goes in to a more mathematical, calculating way to view how to write words for Japanese songs.
I wonder if the latter is old-fashioned/customary method compared to a more modern, contemporary method.
Any help, opinion or further advice on this matter would be very appreciated.