Was never that big on the Op, but Ed for Psychopass was always unskippable.
youtube.com
As for other Ops and Eds
Baccano Op
youtube.com
Lodoss War TV Op
youtube.com
Wanted Adesso e Fortuna from the OVA but there's no vid up I can find. Can find the full version audio, though
youtube.com
Noir Ed
youtube.com
Bakuretsu Huner's Ed
youtube.com