Do all sounds/samples have to be transposed to the key of the song? If so, what's the easiest way other than listening?

I don't have the greatest ear for recognising correct or incorrect key, and I'm wondering if I should be transposing all of my sounds or just some of them?

Submitted December 26, 2017 at 09:41PM by LewisSomerville https://www.reddit.com/r/edmproduction/comments/7mbm11/do_all_soundssamples_have_to_be_transposed_to_the/?utm_source=ifttt

Javier Rodriguez