Most of the people will just surf on the web and download pictures and music they like and use it on their blogs or websites. To be honest, it's really not a big problem if you are an owner of a blog or a casual website. However, in many cases, let say you are working on a site for the government or a well-known organization, you want to make sure that all the pictures and music you use on the web are royalty free so you can use them legally.
To sum up, you need to check two things for music and photo you want to use on your website or blog:
1) it's free (I know stock photo and music is getting cheaper these days, but free is still better)
2) it's royalty-free
Here are a few good websites that meet the above 2 conditions:
1) Dreamstime - Download Free Stock Images and Photos
2) stock.xchng - the leading free stock photography site
3) Presentationhelpdesk.com - Download Royalty Free Music
