The above post is one of the most incoherent and poorly executed posts I've read in a while. I don't know you, allbecauseofu2, so I have no idea if you are a native speaker or not, but I'm sure you can do better than that. People, correct spelling and grammar are important so that your thoughts and ideas can be readily understood by others.
"Their". Plus you are missing an "is" after "this".
"It's".
I don't even know what this means.
There should not be a space before the comma. Furthermore, as "CDs" is a plural rather than a possessive, it does not require an apostrophe.
"Which". There should not be a space before the full stop. May I also recommend capitalisation?
"Similarities" and "bands' sounds". Each band has its own sound, hence the plural, and "bands" is being used as a plural possessive, hence the apostrophe placement.
Again, "similarities", and it should be preceded by "of".
Also, you might want to tone down the use of sentence fragments. This is the Internet, so there's more room for sentence fragments and other casual turns of speech, but after a while it becomes too damaging to the coherence of your posts.