What I need is the same solution: The visitor will listen a music (you can use any plugin that you want BUT need to have compatibility with WordPress, so I can easy upload a new music) and if they like, they will select the music via a checkbox button and the selection will be displayed at the left section "the form".
In the field "sua seleção" will show all music that the visitor selected and then wil also show the forms input: "Data, Local, Nome and E-mail". It's better if you use a solution that is easily modified via WordPress (Custom Post Type, Taxonomies, Options Page, I don't know).
The actual solution is not good: http://musikalband.com.br/site/?page_id=7 since it gets the music from Grooveshark (I want a internal player and I know there is a lot of plugins of WordPress that can use this feature) + the form is in the sidebar, I want in the same page so it can be easily integrated with the whole layout (you don't need to customize the CSS, I'll create a new full page via CSS). What I need it's just the Player + Selection of the songs + The Form.