I would like to change the color of the square tabs in my profile "my apps, quick share, admin panel, details". The backgrounds of these tabs are a light blue, but in the code I do not know what they are referred to so I can changed the background color.

What are these called?

And I would also like to know if anyone has had success in installing a different music player interface?

change the color of tabs in your themes page.css

.block_title {
background:none repeat scroll 0 0 #E1Ecf4; <--change this
border-top:1px solid #C1D8EA;
color:#333333;
}