Soundtracks of Movies

I think that this is technically correct, but would sound much better as "Movie Soundtracks".

I love to listen to movie soundtracks of movies.

Sometimes, before the I watching movies, I listen to their soundtracks, songs of the movies.

One of themis playin og in the background right now.

The name of the movie is "Once", and song's name is "If yYou wWant mMe".

In English, the titles of things normally have all uppercased nouns, verbs, pronouns, adjectives, adverbs, etc.

Before the watching this movie, I already knoew all the songs.

Whileen I watching the movie and, it makes me happy, hearing all the songs that I know and love, it makes me happy.

"While" is normally used for when two events are going on at the same time. For example: While John watched the play, Andrew threw a party.

I want to watch to a movie that name is named "Sado" (The tThrone).

But I couldn't bring itmyself to watch myselfit .

Because, the soundtrack is rippingtears open my heart.

By the way, I am sharing the links of the songs that I mentioned above.

"I am" is commonly written as "I'm".

Movie Soundtracks of Movies

I love to listen to movie soundtracks of movies.

Sometimes, before the watching the movies, I listen to the soundtracks, songs of the movies.

or "Sometimes, before watching a movie, I listen to its soundtrack."
Songs are parts of a soundtrack, so you don't need to mention them.

One of themis playin og in the background right now.

The name of the movie is Once, and song's name is "If you want me".

suggestion: The name of the movie is "Once" and the song is (called) "If You Want Me"

Before the watching this movie, I already knoew all the songs.

or
"Before I watched this movie, I already knew all the songs"

While watching the movie and hearing the songs that I know and love, it makes me happy.

"Watching the movie and hearing the songs that I know and love" is actually the subject of this sentence.
or
"While watching the movie and hearing the songs that I know and love, I was happy"

I want to watch to a movie that name is called "Sado" (The throne).

But I couldan't bring it to watch myself.

present tense because your next sentence is present tense.

Because, the soundtrack is rippbreaking my heart.