Garage band

I can use the software garage band if i wanna make a song of my own combine different rhythm and change the beats of the tempo.I can also use it by making a song with my own lyrics and adding the beat i want .i can do this by writting my own lyrics and adding it to the garage band and changing the tempo of my songs words.So by that i can apply my song in my phone and have it as a ringtone that on one ever has.