25 or 6 to 4 by Chicago. What does it mean?

Which HD download did the OP pick of Chicago II?

There is a new/just released 2017 remastering by Steve Wilson that is supposed to be 'da bomb'.

like most critics, i'd generally (and unfairly) dismissed chicago as aor drivel. however after listening to the steve wilson remaster i was curious enough to listen again to their first and third albums and was struck by how listenable they are. there's a lot of aimless instrumentals and the big hits are profoundly overexposed, but there's are a lot of good deep tracks (including an uncanny csny rip on the third record) and terry kath is sort of an overlooked ace on guitar.

Blood, Sweat, & Tears, and then Chicago (who sprung up in the wake of the success of B,S,&T), were really a Godsend for the guys playing horn in the High School marching band. Historically considered squares/nerds, it was suddenly okay to be a trumpet or trombone player. Saxes were different, always a cool Rock ’n’ Roll/Jump Blues instrument.

Loomisjohnson, just wish to opine on your comment "terry kath is sort of an overlooked ace on guitar".  Kath was, and still is considered one of the great guitar prodigies of rock music.  He was the heart and soul of Chicago's drive.  Jimi Hendrix himself after a show reportedly said that Kath was better than him (true story, who knows?).  Dozens of articles over the years with titles like "most underrated guitarist", "greatest guitar player you never heard" etc. attest to the respect Kath received and so rightly deserved.  Much like the Allman Brothers I feel Chicago died along with Terry Kath although the ABB recovered more completely over time.  While Cetera is an outstanding bassist and Lamm's keyboard skills are without question I have always felt both would have been better off writing for Barry Manilow once Kath's intensity was taken from Chicago.  So to sum up, while I am with you 100% on "guitar ace", not so much on "overlooked" unless we stipulate "among those who are only aware of music after 1978".  Anyway, thanks for mentioning him.  The fact he is still being discussed 35 years after a way too short career shows his true impact.  

BTW, I have downloaded the recent Steve Wilson remix and it does sound mighty fine in my car.  I have to wait for my soundcard to come back from repair to listen on my home system and compare it to my vinyl original.