I do listen to the drummer a lot but I do find different people make a song at different times, you just couldn't listen intently to the drumming in Comfortably Numb and ignore the guitar nor Stairway to Heaven, Hotel California or Sultans of Swing to name a few. There are many amazing bass players out there, I love some of the old disco songs from the 70's / 80's but only because of the amazing bass playing and you definitely don't listen to those for the drumming, I love listening to Jack Bruce, Mark King, Pino, Palladino. Watching Max Beezley playing piano for Mr Bo Jangles on Robbie's Knebworth CD, I could just go on and on and on, the list is endless so I think it totally depends on the song and what each member and my attention will go to a great vocalist, pianist, guitarist or indeed drummer depending on who's doing what at the time but I'm probably always very aware of what the drummer's doing in context to what else is going on.