I am a drummer and stamp collector. I feel happy to get cards / stamps with drums / percussion on it.
But all other motives of musical instruments or (metal) bands are es well a pleasure.
If you don´t have something like that - nevermind. I am glad to get a card with unusual stamps or cards with quads, (motor)bikes or fun cars.
And allways wellcome are cards from where you live at, especially if there are secret or mystic places.