Cheap Trick, Chicago, Deep Purple, Steve Miller and N.W.A. have already been sure thing guests for this year's Rock and Roll Hall of Fame and Museum induction ceremony (they're the ones entering the Hall of Fame, after all), but now there is a little insight for the night's other guests. On Thursday (Jan. 28), it was announced that Metallica's Lars Ulrich, The Black Keys and Rob Thomas will be attending this year's ceremony.

According to Billboard, Ulrich, The Black Keys and Thomas are among those who will be the night's special guests. It's unknown what role these acts will be playing in the evening's ceremonies, but it's assumed they will be among those who will induct Cheap Trick, Chicago, Deep Purple, Steve Miller and N.W.A. into the Rock Hall.

However, it's speculated that Ulrich, who has been a major proponent of Deep Purple's induction, will be ushering them into the hall.

Ulrich's own band Metallica was inducted in to the Rock and Roll Hall of Fame in 2009.

The Rock and Roll Hall of Fame induction ceremony is set to take place on Friday, April 8, at the Barclays Center in Brooklyn. The Rock Hall itself, of course, is located in Cleveland and is set to feature an exhibit featuring this year's inductees in conjunction with the ceremony.

Cheap Trick, Chicago, Deep Purple, Steve Miller and N.W.A. beat out a broad scope of acts to make it into the Rock Hall. Other potential new members included Janet Jackson, Nine Inch Nails, The Smiths, Chaka Khan and Chic.