"We didn't write a long explanation about the music in this album; it just isn't necessary. The music swings, it is down to earth, and if you're the kind of person who likes to put some groovy sounds on the hi-fi and party awhile, it'll gas you."
While I'm not shocked to see "hi-fi","groovy" and "gas" all in one sentence on the back of a 1965 jazz record, especially on one that has 3 Beatles covers (on a 7 song LP), I am surprised to see "party" used as a verb 40 years ago, as it seems to be still used that way today without sounding as dated as terms like "groovy" or "gas" used as a verb.*
*except when talking about Kurds, I mean.