the

[maarefvandm]

Dear Teacher,

I easily confuse with using of "The". I do not when I should use for example the "the effect of the music perception" and the effect of music perception especially about the second the in of- clauses. If you introduce me a site or grammar book covering this specific problem I would appreciate you.

Best regards,

[Bennevis]

It's all about definiteness. There are numerous websites talking about article usage. Just google it. Practically everyone not born and raised in an Anglophone country will always be struggling with article usage.
If you are really, really serious about mastering English articles, I'd suggest you reading this:
http://www.rpi.edu/dept/llc/writecenter/ascii/esl.txt

[Tdol]

Dear Teacher,

I easily confuse with using of "The". I do not when I should use for example the "the effect of the music perception" and the effect of music perception especially about the second the in of- clauses. If you introduce me a site or grammar book covering this specific problem I would appreciate you.

Best regards,

Are you talking about music perception in general?