Love Live! Beginning parts of Susume → Tomorrow 「ススメ→トゥモロウ」
First clip is from episode one.
Second clip is from the last episode.
Third clip is from season two, episode one.
I really love them singing the start of this song so much so I made this for me (That's why it's not very good quality...I need a better computer). But I thought I'd share it and post it for others.