I have designed a website called GoMuzik where ppl can search and listen to there favourite mp3 songs

http://www.gomuzik.com/

As my question is, is my site looks Professional, I am having trouble attracting user.

Please suggest me I can make it better.

Searches for some of my favorite recording artists didn't find much. Why should I use your site, rather than some other site?

I recommend that you fix the markup errors and CSS errors reported by the online tools.

Don't use px for font sizes. Use 100% for body text, larger percentages for headings and the like, and (slightly) smaller percentages for legalese and similar fine print.