I can’t believe this thread’s been around for over a year and no one has mentioned the third grader synth interlude in the middle of Heart’s - Magic Man.
Eddie, are you still writing “2015” on your checks? 
At the end of Percy Sledge’s “When a Man Loves a Woman,” the trumpet comes in and IT’S OUT OF TUNE. Drills through my head like an earwig.
Star Trek (TOS): lovely theme song with BONGO DRUMS throughout. :mad:
I just heard that song for the first time in a long time, and I was thinking, you know, if you cut that silly middle part out, it would be a cool (but short) song.
Another one to make good use of Sound Studio/Audacity is GFR’s I’m Your Captain/Closer to Home. That ending repeats longer than Hey Jude, and it’s even less interesting. Sure, it is evocative of a poor guy on a life raft in the huge ocean, but it’s not interesting!
In a reverse version, I wonder if one should remove the entire singing part from John Cougar sans Mellancamp’s I Need A Lover and just leave that long intro. Treat it like an instrumental. 
InstallLSC might, considering he was the thread reviver.
I always thought the ending of “Got to Get You Into My Life” felt tacked on, especially as it quickly fades out. And “For No One”'s ending felt too abrupt.
Had thought about its own thread for this, but I think here is better…
(Some folks with complete disdain for this band need not comment)
I am far from a dyed-in-the-wool deadhead, but I do like a good number of Grateful Dead tunes. That being said, they have more than one song where the bridges are apparent afterthoughts, and not very good ones at that - mostly contrived chord changes and off-kilt time signature mods that don’t jibe at all with the rest of the verses/choruses.
Cumberland Blues - “Make good money, five dollars a day…”
Dire Wolf - “I sat down to my supper, 'twas a bottle of red whisky…”
He’s Gone - “Goin’ where the wind don’t blow so strange…”
High Time - “I was losing time…”
Let It Grow - “What shall we say, shall we call it by a name…”
Steven Wright had a joke about that “I will now play everything the Beatles ever wrote… I won’t play all of Hey Jude”
For all of those struggling to identify which “nah nah” song is being spoken about, I’ll just leave this here.
OTOH, that somehow lacks the “Hey Jude” branch, so I guess it’s still under development? 
ETA: found a slightly obscure updated version that fixes the noted deficiency. Et voila!
If we had a sub-thread of Great Songs with Terrible Endings, I would nominate CS&N “Long Time Gone”. Where it could and should just stop, we get a few seconds of random organ noodling, following a silly little cymbal “ting”. WTF was that?
The first record I ever bought was The Byrds’ “Eight Miles High” and at the time, even with my adolescent untrained ear, I thought “this is a completely perfect wonderful song…except for that godawaful guitar solo. What were they thinking?”
I like Gordon Lightfoot, I like songs with a story, but let’s face it, The Wreck of the Edmund Fitzgerald would have worked just as well if it were three minutes shorter. I could have done without verses 2,5 and 6.
A friend (who was not too music savvy) and I were hanging around one day, and* Eight Miles High *came on the radio, and after the aforementioned solo, he chimes in with, “They put that part in there just to piss off your parents”.
The extra verses help convey the heavy and interminable terror the crew of the doomed ship felt. Very atmospheric.
ETA: The clues are right in the lyrics!
According to Dave Barry, some of the Beatles are still singing the “na na na” part.
That dreadful sax solo in “The One Thing” by INXS.
“When the Music’s Over” would be my favorite song by The Doors, if not for Robby Krieger’s horrible feedback-laden guitar solo plopped right in the middle like a great big steaming elephant turd. Seriously Robby, what drugs were you on??
They were thinking they were copying John Coltrane. Seriously.
Here’s an obscure one: the epic piano solo in X-Japan’s “Art of Life”, which begins at the 15-minute mark (the full song is 29 minutes long.) Starts off nice and sweet, but then descends into…eh, no words can describe. On the other hand, it’s one of those rare moments that goes from awesome to terrible all the way back around to awesome again.
That’s as good an explanation as any. The alternative is “because they were high”, which was probably true, too.
I’ll agree with “interminable.”
The Church’s “Under the Milky Way” is a wonderful, beautiful song - except for the bagpipe solo in the middle. Were they miking something in the next studio and just left it in?
Best sound from a Bagpipe? Landing on the bottom of an empty dumpster!
The Next Best?
Hitting a banjo on the way down!