Wow, some of these are hard.
Album: Symphony X, Underworld. Biggest surprise of the year for me.
Song: Not sure, but Hellfire and Toxic Remedies off the new Queensryche album are definite contenders.
Book: I haven't read anything that was released in 2015. In fact, my pleasure reading (outside the Bible) has been really limited this past year. The only thing I can recall for certain is the Hunger Games series (read to see whether appropriate for my 12 year old), and that was excellent.
Movie: Hmm...probably The Force Awakens. If I took my time, I might be able to come up with something I enjoyed more, but I enjoyed this one A LOT. And given that it had so much build-up and still did not disappoint, I have no problem just picking it.
TV Show: Would have to be Agents of SHIELD. Best series on right now, although I feel like season 2 was stronger.
Video Game: Dunno. Haven't really played any, other than Greed for Glory on my phone. Since I am a total addict, I guess I have to pick that. ...which I guess I don't really have a problem with, but it just seems odd not picking something that you would play on a console or computer. It isn't nearly as immersive as some of the stuff I used to play on console/computer back in the day, but I love it and on it constantly, so...