Three+ months later I have to chime in on the key changes in the Stan Bush song. Even though I have to admit that they are unexpected, they are actually not that random and not discordant at all. Before the first key change (intro to verse excluded) from the verse (which is in A minor) into the bridge, the last chord is G major and the first chord of the bridge is B minor, in which key the G chord is submediant to B minor. Same goes for the next key change up to C# minor, where the last chord in the B minor key was an A major, which is the submediant chord in C# minor. It then lands on a B major and falls down to the G# minor key for the chorus, where B is the mediant chord in the G# minor scale. The end of the chorus ends with an E major and then goes back to A minor for the verse, where the E major chord is the dominant.
I used to be able to pause and play video by clicking the mouse on the video, but now it just pauses temporarily as long as I'm holding down the mouse button. The keyboard shortcuts (K / spacebar) don't work for me in Chrome, OS X Yosemite. K does nothing and spacebar scrolls down the page.
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