Run script when get a certain notification

Question

Spotify sends a notify-send when the track changes, so when this happens I want to run a certain script to get the current song name, fetch the song's lyrics with clyrics and put it on conky. Since English is not my first language it'd be very helpful. I could do some script that keeps checking the current playing song on Spotify with dbus but I guess the way I want to do it is more elegant. Is that possible? PS: I use Dunst for notifications.