Exercise 1: Strum your kantele with your right hand. With the left hand, change between the chords "D" and "A7". Repeat that often!
Exercise 2: Play and sing the following song "He's got the whole world". You only need the chords "D" and "A7"!
Exercise 3: Play and sing the old Finnish folk song "Suutarin emännän kehtolaulu"! You only need the three chords D, G and A7!