Hello,
I understand your concern for develop a website where user can sell their demo music.
I will certainly design and develop website for you as per your requirement.
Please share the more details about your project, so I can visualize the things more, and provide you the best solution.
Technically I am competent in PHP (v5.5 & 5.6), CodeIgniter, WordPress, Magento, Joomla, MySQL, HTML/HTML5, CSS/CSS3, Ajax, jQuery, Bootstrap v3, JavaScript etc.
Please do ping to discuss further.
Thanks & Regards
Brijesh R, Web Expert