Christians, what is your favorite hymn/spiritual song?

Just wondering which hymns/spiritual songs Christians are into these days. Is it still the old classics, such as 'Amazing grace', 'When I survey the wondrous cross', 'Holy, holy holy', 'What a friend we have in Jesus' etc. or are the contemporary songs more popular. I guess it depends who I'm talking to, but I am particularly interested in the younger generations, which I guess are more likely using this site.