Song: An accelerating, descending phrase lasting about 2-3 seconds that ends in a characteristic flourish - phonetically something like "chip-chip-chip-chooeeyoo-chooeeyoo-vit-chweet". Each male has its own dialect - the song varies from region to region and young males learn it from their neighbours.
Call: The well-known "pink-pink" (or "bink-bink") - heard year-round and one of the most common bird sounds in Sweden.
Alarm: A repeated, harsh "wheet" when a bird of prey is overhead; a sharp "tink" for a ground-based threat.
Listen to Common Chaffinch song on xeno-canto and see observations on Artportalen (the Swedish species observation system).