For some reason the songs seem to play back faster than they should. Any ideas?
How much faster? Have you timed the playback speed with a stop watch and compared the actual duration with the duration (Time) in the browser?
If youtube plays back slower, it might be caused by the network.
I have only seen this on iTunes for Windows so far - you are not by any chance on Windows right now, are you?😉
Are you running the latest version of iTunes?
And do you have any non-standard Audio devices installed - look at System Preferences > Audio > Output ?
Did you install any Audio Drivers?
Also look at the Audio Devices in Audio MIDI setup (Applications > Utilities):
Check the Format for you output device if it is set to 441000 Hz (compare the setting to the sample rate you see on your songs in the iTunes Library).
If this setting is wrong, iTunes may try to playback at the wrong speed.
Regards
Léonie