Use this spinner wheel to get a song key. Writing songs in different key help build diversity and stimulate new song ideas
While it is true that you can use any form and insure a maximum amount of both repetition and musical interest, always remember that a spare lyric at a slower tempo has more of an obligation to be interesting. You’re making the listener wait for that lyric to unfold, and it had better be worth the wait. The same is true of the music.