One of the most famous classical poems about dolphins is "The Dolphin" by James Reeves:
The Dolphin
I would be a dolphin,
I would swim in the sea;
the wind and the spray,
and the wet, wild play
of the waves appeal to me.
I would be a dolphin,
and live in the sea;
and wander about
the waterspout
with my mates in harmony.
I would be a dolphin,
I would swim in the sea;
I would bask on the brine, and would bound like the swine
who leap and are glad with me.
This poem captures the spirit of the dolphin and its affinity for the sea. James Reeves, the poet, beautifully describes the dolphin's playful and free-spirited nature.