Maybe there is a difference and the above ability is the difference between a great songwriter and the writer of a great song?

Trouble is their success then puts them in a different place. How many more songs do we need like ones about 'waiting at the railway station' or 'leaving on a jet plane?

I did the test of all the songwriters memtioned so far in this thread. The most memorable songs I could come up with (without looking any up) 15+ for a couple of them.

Most were only about 2 or 3. One, I struggled to find even one song for.