Imagine Dragons is a great band.  I can't believe they came from Las Vegas, Nevada.
My little sister really likes them.  I have never heard them.
They really gained popularity after their debut album "Night Visions" was released in 2012.  That spawned all of the annoying covers of "Radioactive" on YouTube.
I think I have actually heard Radioactive.. or at least I have heard an annoying cover or two.
It took around 3 years to record "Night Visions" . . . it was recorded between 2010 and 2012.  The band produced the album themselves.
I recently saw that they had had all four of the top songs on the pop charts.  I thought that was cool.  Maybe I should give them a listen sometime.
They are extremely popular.  They were at the top of the "Year in Rock" rankings by Billboard in 2013 and 2017.
Are they the group that does "Thunder"?  
Yes they are.  Imagine Dragons has released "Evolve" in 2017, which had both "Believer" and "Thunder" in its tracks listing..