"And then the penguin said, 'No, you give me your hand!!' lol"

Local indie-alt outfit For The Mathematics release their shiny new EP We Impend at Barrymore's tonight, which serves as the follow-up to their 2004 debut The New Science, which got major campus radio play and put the band on the map. Though touring for three years and playing 100+ shows probably helped that, too.
You can go preview the first single off the EP, "A Versus", on their myspace; the play count for it is currently at 1337, neato. And you can grab another mp3 from the new release in the post two below this one.
-->For The Mathematics - Delay The Fiasco

Fellow Ottawans Embassies Of Denmark and Bangkok open, tickets are $6 advance and $8 at the door.

For something on the lighter side, you can go watch locals Stairwell K play their last show as a band at The Rainbow, with Donkeypunch openning.
Or, if you're up for the drive, you could head down to The Black Sheep Inn to see some "South Asian electronica" courtesy of Toronto's LAL, who share the bill with another Toronto band, genre-benders Stop Die Resuscitate.