To have to wade through Flash intros and splash pages every visit is frustrating and annoying, especially when you consider that the great majority of visitors have slow, dial-up connections. Flash can be used for good but rarely is. You should never add a design element to your site just to show that you can. The two most important factors to consider when presenting your written content are readability and printability. Both are killed easily by bad backgrounds.
Readability is enhanced by contrast.
It's much easier to read black text on a white background than pink text on a green background. Also, using patterned backgrounds is almost always a great way to confuse a reader. By far the most common background mistake in music sites, though, is the use of a black background. Such a mistake is partially redeemable by using white text for high contrast. However, if you believe your content is valuable enough for visitors to print, you should stick to black text on a white background.