GMO mentions the singing revolution, too: "Collective singing of popular songs was an inseparable part of the ‘singing revolution’ in Estonia which led to the restoration of independence in 1991." Lippus, U., & Rüütel, I. (2001). Estonia. Grove Music Online. Retrieved 13 Jun. 2025, from https://www-oxfordmusiconline-com.ezp.hfm-nuernberg.de/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-0000041040.