The fact that Queen will be joined by ex-American Idol finalist Adam Lambert for a series of concerts this summer has been a much-talked-about subject, but on Saturday, fans will get to see what all the fuss is about. 

Queen and Lambert will be performing this Saturday in Kiev, Ukraine, as part of a charity event dedicated to the fight against HIV/AIDS.  Elton John also is on the bill for the show, which is expected to draw hundreds of thousands of people to Kiev’s main square.

The Kiev show is one of six in total that Lambert will perform with Queen this summer, as he assumes the frontman role that’s remained officially vacant since the band’s lead singer Freddie Mercury died in 1991 of an AIDS-related illness.  A variety of other vocalists have performed with Queen since then, and the Idol alum knows how lucky he is to have the opportunity this time around.

“For me, personally, I think I’m gonna look back on this in years to come and kind of think, ‘Wow, what a treat. What an honor to be able to be asked to sing with legends,’” he tells ABC News Radio.  “Their music is iconic and Freddie Mercury, for me, is obviously one the the very great performers in history and a definite idol for me.”

Lambert says the opportunity to “get up there and to pay homage” to Mercury, and “pay respect to his memory as a performer” is something he says he’ll remember “for the rest of my life.”

Adam also sees the Queen team-up as an educational experience.  “I…think that I’m gonna learn a lot from it,” he tells ABC News Radio.  “You know, working with [Queen]…. these guys have been in the business a long time and they’ve seen a lot and they’ve…been through time and trends…I think there’s something really magical about that.”

Queen songs are among the most difficult rock tunes to sing, because of their intricate arrangements and wide vocal range.  So, are there any Queen songs he’s just not going to attempt to do?  Lambert laughs, “There are a few that are daunting, let me tell ya!  And then there’s some that I’ve sung many times before.  So, I’m excited for the challenge.”

This isn’t the first time Queen and Lambert have performed together, of course: They first teamed up on the American Idol season-eight finale, where Adam faced off against Kris Allen and lost.  Lambert also sang with Queen in 2011 at the MTV European Awards.

Copyright 2012 ABC News Radio