5: Counting Stars
It's neither rock nor alternative :/
Well, one for each subgenre (only some of them):
alternative metal: Faith No More - Midlife Crisis
emo-pop: Anberlin - Paperthin Hymn
garage rock revival: The White Stripes - Fell In Love With A Girl
glam rock: Suede - Beautiful Ones
gothic rock: The Sisters of Mercy - Lucretia, My Reflection
hard rock: Black Sabbath - Paranoid
indie rock: Arcade Fire - Rebellion (Lies)
pop punk: Bad Religion - 21st Century
post-britpop: The Verve - Lucky Man
post-grunge: Foo Fighters - Everlong
post-punk/new wave: The Chameleons - In Shreds
shoegaze: My Bloody Valentine - When You Sleep
surf rock: Dick Dale - Miserlou
synth pop: OMD - Electricity
overall: Nirvana - Smells Like Teen Spirit