What subreddit i could ask for a free music composer app (Whether on PC or android)?

I searched for so long for a music composing app that doesn't have lots and lots of subscription popups, and currently only found My Singing Monsters (which has very few instruments i mean monsters to choose). Wondered what those videos i find on youtube use to create such bangers, but never got the answer. What free app is still available for me? (i dont mind ads, i just never want to pay an hourly subscription just to use it)