So I did 'Something Happened on the Way to Heaven' and the original version is a ballad. The original Phil record is uptempo but we slowed it down and made it a ballad.
The same song can have drastically different feels and personalities just by changing some minor things. A different drumbeat or some vocal overdub could completely transform the song.
It is hard work composing a song for a film and showing it to makers: 50% of the tune remains the same, and the remaining 50% is changed to suit the script.
I find it really irritating when a band changes the melody of a song you know.
My earliest attempts at writing were when I was seven. I would sit at the piano and transcribe the songs I heard on the radio. I'd change little things in the music and write different lyrics.
I've never used the word jamming. It's a matter of finding a great song and learning the chords, then slightly altering the vocal melody, and matching a classic chord progression with another chord progression.
A different drumbeat or some vocal overdub could completely transform the song.
But I'm just having fun playing and giving Botox injections to the older songs.