What are the styles of seven ancient poems in Tang Dynasty?

People in the Tang Dynasty sang songs with various styles. The four great masters, Zhang and the Seven Classics, are extravagant and have a kind of Han Fu; Elegant, born from the palace. Du Li, two males, are just atmospheric males, each leading the way. The songs of Li Bai and Cen Can are rich in emotion, unique in brushwork and elegant in style. Du Fu's and Han Yu's songs are full of melancholy feelings, vigorous brushwork and strange style. Bai Yuan's songs take things as shapes, which are popular and simple, with melodious sentences and melodious voices.