I fully agree with ds1984 on that 'all about the song’ thing
or that 'song is king' thing
it's a nonsense. If you write/compose a song, you can do what you want with it
I never understood : why for example you don't know you're born "needs" an outro with a long solo, and Hill farmer's blues doesn't need it ? .... oh wait, when played it live, it needs one !
so, all songs can have long instrumental section if the composer wants to, and all songs can have no solo if the composer wants to.
I can't see why a sepcial song would "need" a solo more than another