The poll was made to simply identify what kind of promo has the most impact on a songs sales, for eg. WFL rocketted up the sales chart as soon as the video came out, but I wonder if it would've has the same sales jump if she performed it on the ellen show or had a high radio audience...

award shows have immediate visible effect usually, but not for everyone.
e.g. Adele's SLY jumping 19-1
e,g. Cockiness not making it into Top 100

videos too, but not always..
e.g. WFL, LFN rocketing in sales
e..g RTW, MTN no effect

neither does airplay work for everyone
e.g. Pink's Blow Me being #1 on radio for week, but not even top 10 iTunes

Awards shows & Radio Airplay.

Radio is the obvious choice when it comes to longevity so I picked Half-Time Shows and by that I mean the Super Bowl. While it didn't work very much for Madonna and GMAYL, her great and classic songs charted really high all those years later. It's much more short term though.

Radio, pretty much.