You've listened to songs on the radio haven't you? You probably know the biggest difference between those tunes and a symphony is their length. A song on the radio lasts about three minutes. A...
The English phrase 'symphonic poem' means an orchestral composition based on literature or folk tales
A symphonic band hasn't got a string section where as a symphonic orchestra does.
If you are referring to the crossword hint a symphonic score is also known as STR.
They helped to popularize the genre and have innovated it.