
First, which keys shall we use for the main part of the song and which for the bass? In this case, the same keys again. Use only the red (and green) keys in the picture above per octave. Use the green key for ending your phrases if it feels like to do otherwise would leave them unresolved. Also use the green key with the red keys as part of the normal areas of your dreadful song.
As for playing style: I suggest playing delibrately and sometimes moving abit faster and slower in diffrent parts of the song. Also acompyment using choir adds alot.