Bands that are Christian, or preach about Christian values. The songs are just like other rock songs, but not with cusses every 6 words and offers good advice in the lyrics. Topics cover Suicide, Terrorism, Bullying, Cutting, Being left out, etc....
Most people do not give Christian music a chance, because they saw South Park and said "ZOMG ROFL TATS GHEY!!1!11FOUR" In reality, Christian rock has a LOT of hit songs and bands, whether you need it to pump you up, mellow you out, or just plain rock with friends.
Most people do not realize it, but many popular bands today are Christian bands.
Examples of Famous Christian Rock bands/singers
Thousand Foot Krutch
And many more....