Who wrote Pictures of Home?

Pictures of Home is one of my all time DP favourites. But who actually wrote what to it?
Heikki Silvennoinen

All our songs were (and still are) the result of jams. RB came up with the main riff but the arrangement was the result of everyone's imput. Since we didn't regard our songs in the old way of top line and lyrics, the whole band contributed by the way they played their instruments, whoever was the instigator of the jam; maybe our way of defining hard rock music from pop music, I don't know. Ian Gillan and I usually wrote the words together, although on POH I think it is more him. Our writing relationship is the same these days - sometimes one contributes more to a song than the other, sometimes it is the same.

Look good,
Roger Glover