a) "put mp3s on the website so people can try before they buy"
Put snippets of the mp3 on the site instead of the full mp3.
b) "setup a shopping cart."
Your hosting company might offer that option.
Galaxy Note 8 vs iPhone X
Awful clip art from 1994 is being tweeted every hour by a bot
How to update iOS on iPhone or iPad
Les meilleures applications pour enfants 2017