Complaining about the current generation's music was, throughout a good portion of the Twentieth Century, a very common Cyclic Trope. Many people in the World War 2 generation, whose parents complained about their jazz and ragtime, later complained about the Baby Boomer generation's rock and roll. Later, much of the Boomer generation complained about the glam rock and heavy metal that was popular with a lot of early Generation X'ers. While some of those early Gen-X'ers later complained about the grunge and rap/hip-hop that was popular with the later Generation X'ers. While the tendency to complain about the "current generation's" music has significantly decreased during the last twenty or so years, you might still see it crop up from time to time (usually among people obsessively pining for their high school or college years).
Parodied in the Spitting Image song Are You Getting Old Or Are We Shite?
"Becoming The Bull" by AtreyuBack and forth the struggle consumes us all. / Trying to keep a level head. / In the most unsettling of times. / Today I'll become the bull. / There is so much to stake. / I stumble I lose my place. / Pride and arrogance surrounded by sin. / Destiny takes its hold. / Fight it or let it go. / But I choose how the day will end.
"Figure 0.9" by Linkin ParkI took what I hated / and made it a part of me / now you've become a part of me / you'll always be right here / you've become a part of me / you'll always be my fear / I can't separate / myself from what I've done / giving up a part of me / I let myself become you
"Outside" by StaindI can see through you / see your True Colors / because inside you're ugly / you're ugly like me / I can see through you / see to the real you
Part of "Open Your Heart" says "You [Eggman] and I [Sonic] are the same in a way that we have our own styles that we won't change".
Country Music singer Miranda Lambert's song "Only Prettier" uses this trope. The song is told in the point of view of a Cool Loser talking to the Alpha Bitch: We might think a little differently/ But we got a lot in common you will see/We're just like you/Only prettier
"Minstrel In The Gallery" by Jethro Tull has the minstrel critiquing on the people in his audience only to encounter this trope: The minstrel in the gallery / looked down on the rabbit-run / then he threw away his looking glass / and saw his face in everyone
Linkin Park also provides what COULD be considered a protagonist-to-"antagonist" version of this trope in "Numb":
"And I know - I may end up failing too... / But I know... / That you were just like me with someone disappointed in you!"
Collin Raye's "Not That Different" explores the similarities between two lovers after the woman in the relationship complains that they're too different.
Ronnie Dunn, formerly of Brooks & Dunn, released a solo single titled "Bleed Red". The song is similar in storyline to the Collin Raye song above.
Vocaloid's Daughter of Revenge has Meiko disposing the evil princess who executed anyone who dared speak against her, but after figuring the Twin Switch with the princess's execution, she decides to continue the execution, essentially sentencing a comparatively innocent person to death, just so that the princess could feel the pain of losing everything she ever loved. She explicitly states that "even if I am called a heroine, I, too, am a Daughter of Evil".
The Blake Shelton-Trace Adkins duet "Hillbilly Bone" and Brantley Gilbert's "Country Must Be Country Wide" both have similar themes: namely, it breaks down the "us vs. them" mindset sometimes present in country music fanbases, and states that Southerners and the rest of the country are not so different.
Polish song Winna by Agnieszka Chylińska. The lyrics are written from perspective of what appears to be either Designated Villain or Card-Carrying Villain (or both). At one point it drops lines that can be roughly tranlated as Because when only I become/more human than you would want/then you can see how/we're much alike.
Billy Joel's "Leningrad", where he details his friendship between himself and a Russian clown he met while touring the Soviet Union, is supposed to express how the Russians can be as human and moral as Americans are. (The song was written during the Cold War.)
Arjona's Song "If The North Were The South" says that if the roles of the USA and Latin America were inverted. Latin America would be "the same, or maybe a little bit worse."
Russians by Sting, a song about how Russians and Americans aren't so different.
We share the same biology, regardless of ideology.
Likewise, "Ordinary People" by The Box. This was a common theme in the '80s, where the enmity between the West and the Soviet Bloc had mellowed considerably on both sides yet the people running the US government seemed determined to keep it alive.
"The Living Years" by Mike and the Mechanics falls into this. Part of the reason the son mourning his deceased father is so cut up about his death is because he realises that a lot of their unresolved conflict was ultimately driven by how similar they were.
In Pink Floyd'sRock OperaThe Wall, as he goes mad from isolation and decay from behind his wall, the protagonist rock star Pink becomes, at least in his head, the same kind of totalitarian Fascist leader his dad died fighting against in World War II (which would be the first "brick" Pink would build the wall from).
The theme of the Chameleon Circuit song "Exterminate Regenerate" is the comparison of the Doctor and Davros/the Daleks in Doctor Who. What really sells it is that for about half the song it's hard to tell whether the Doctor or Davros is the actual viewpoint character.