Music in itunes and on iPhone are different

Question

I've just recently done the newest download for the iPhone 4, and now all of my music is different. The update changed my music on my phone but not in my library. So how do I fix it? For instance, something like a song from Spring Awakening, the library will read
Song: Mama Who Bore Me
Artist: SPRING AWAKENING
Album: Lea Michele
the iPhone will read
Song: Mama Who Bore Me
Artist:Duncan Shiek
Album: Lea Michele
The library is the right one, and it thinks the iPhone is saying the right thing, but when you go in and look, it's not. How to I get them to match???
If I delete the music, rename the artist and resync, it doesn't matter, the exact same thing happens.
What am I missing?!?!?!! It's driving me crazy!!!
Stupid Update!!!!

Answer 1

I’ve read reports from many other iTunes users who are having the same issue I am.  Please read on...
When listening to songs that I purchased from iTunes (as opposed to those I imported from CD), several, but not all, of them stop playing prematurely several seconds (or even minutes) before the end of the tune.  Playback jumps immediately to the beginning of the next tune. 
I noticed this, I believe, shortly after moving my iTunes library to a new iMac (3.1 GHz Intel Core i5, 12 GB memory) running iTunes 10.5.3 (3) on Mac OS 10.7.3.  Everything was fine before the move.
Of the 283 purchased songs in my iTunes library, about 100 of them exhibit this behavior.  The song playback times at which this happens range from 2:14 to 5:19.
What is interesting, is that tunes from the same album all end at the same playback time!  For example, I purchased the whole album “River - The Joni Letters” (Herbie Hancock’s album covering a number of Joni Mitchell tunes).  Every song from that album now stops playing at 3:39.  The same happens with other tunes that happen to be from the same album, too.  I have no idea why this would be the case, but it certainly seems significant.
Another interesting finding, is that if I copy one of tunes exhibiting this issue to the desktop and play it from there, the song plays all the way through to the end without a problem.  This would, I think, rule out a corrupt file and tend to point to iTunes itself as the source of the problem.
The problem certainly is annoying, and it would be great if we could find some resolution and get back to enjoying our music without the mind-jarring bump that too often now happens without warning.
Sincerely,
Michael Loomis