System of a down – Lonely day (cover) Jan 11, 2016 Cover Cover, Cover Lonely Day, Cover Metal, Cover Rock, Cover System Of A Down, Hypnotize, Mezmerize, Today I tried to sing Lonely day by System of a down… I hope you enjoy it.. :D. Like 0 Thanks! You've already liked this « System of a Down – Toxicity (Full Album Medley & Guitar Cover) » System of a Down – Spiders [Cover by Likie]