Cpyright in youtube

I recently uploaded a video on youtube and after uploading it showed 'Matched copyright content" which means it cannot be monetised.
Anyway after that I uploaded a different video with a different song but this time I cut some of the portions
of the song and it came down to 2:05 original was 3:46 and it was monetised on youtube seeing this I really became very happy. Now whether I am mad or youtube is. 3 days ago I uploaded a video with a different song and this time also I cut some portions of the song and you know what it showed 'MATCHED COPYRIGHT CONTENT' which means it cannot be 'MONETISED'. Why is this thing happening ???? Please help me getting rid of this copyright content please.

Making AMVs is illegal by nature. Hence you cannot monetize your videos, that's not youtube's fault, it's just that you're using sources from other people, let alone sharing it, monetizing a video without having the right from the owner of the anime and song is illegal and if Youtube lets you do that, it won't take long before you get a strike.

If you still want to avoid that, the best way is probably to pitch your song (a bit like nightcore), still, it's a very bad idea to try and monetize it.

'Pitch it' I don't get it. Is it possible in Sony Vegas Pro???????

just search for non copyright song or non copyrighted rock in youtube & you will find some great song & try to upload the song only to youtube to make sure that it's monetize
and about the anime don't use more than 10 second per clip
& you will not get copyright
that's what i'm doing