Can you a Sonnet write without its rhyme?
Now people want the modern verse that's free;
As ideas get stuck and cramped with time,
A Sonnet's like leafless branches of tree!

A Sonnet's great for men who rhyme too well;
Its beauty lives in metre, rhythm, rhyme;
Yet, it can never run into 'pel-mel';
The sonneteer can write in any clime.

Why abhor rhymes and not a Sonnet write?
Each genre has its rules to comply with;
Why sleep all day and stay awake all night?
Rhyme-play is done by Kindergarden kith!

Why ridicule something you can't do well,
Much things are done by practice, Sonnets tell.

Dr John Celes

http://www.poemhunter.com/poem/sonnet-sonnet-needs-rhymes/