Too many to choose from and all rather varied 
Raining Blood - Slayer. Reminds me of the best gig ever, Nottingham Rock City 2000.
Cowboys from hell - Pantera. Best song to sing along/head bang to when I went to rock clubs. (XL's/The Deep/The Cage/First Base)
Master of Puppets - Metallica. As above.
Down Under - Men at work. Just makes me smile when I hear it.
Three times a lady - Commodores
Totally go gooey at this song and I adore Lionel Richie.
Africa - Toto
Just love it.
Come on Eileen - Dexys midnight runners. Always played at the end of the night at The Cage in Wolverhampton in a bid to get everyone to leave but it was great to sing along to when pissed.
Wuthering Heights - Kate Bush. My dad adored Kate Bush.
The Snake - Al thingamy. Mum, dad and eldest brother all love Northern Soul and this is one I like to sing along to. Also have a very cringey memory of dancing alone to this on a very drunken night at Xmas. 
Layla - Derek and the Dominoes. One of my dad's favourite songs so I shed a little tear whenever I hear it.