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Over It: http://www.encoremusic.com/piano/1707805_alt_ge.html
Somewhere Over the Rainbow: http://www.encoremusic.com/piano/1706558_alt_ge.html?se=48_32255_f9a9a40b84f2179d14dbecfacf4e326a_1213480725
I think it's A-flat major, or F minor. I had trouble remembering, too - I had to go over the scales in my head. The lowest vocal note on that Over It page is E-flat below middle C, which is well within the tenor area, out of the range of a standard trumpet. (I know nothing about the vocal ranges of singers, so my frame of reference is with brass instruments. )
I remember I had a big discussion here way back in 2006 (this site's golden era) with someone about the original key of "Over the Rainbow" and whether the standard sheet music sold on the market today was the original or re-arranged to suit the DF arrangement for Kat. Turns out that A-flat is the original key it was written in when I thought it was in a lower key back in the original song sheet of 1939. Considering the song was written pretty much with Judy Garland in mind, her sweet range was pretty much in A-flat. Some have claimed that Kat sings the song in the same key, and I think that's right on the money.
But thanks for finding the sheet music for that again, trsf, and for "OI." It's always interesting to be reminded that "Over It" starts out in F minor and eventually resolves in an A-flat fade-out. One thing I've noted about "OtR"--it's become the numero uno ever-inflating power ballad of the 20th and 21st century. Even Judy Garland took it to histrionic heights in her later years. Eventually, we've seen and heard it sung so high and diffusely that it feels like a giant bubble about ready to burst. Fortunately, Kat didn't make it quite so histrionic and brought back the vulnerable (or fragile) emotion behind it that Judy Garland did. That's why so many people consider it almost equal with Garland's now: They both really meant it when they sang those lyrics. Others just use it as a vehicle to show off vocal skill or shatter more glass than Mariah already has.
I've been so busy with my writing career lately that I haven't had much of a chance to learn new songs or create my own. Nevertheless, whenever I manage to inadvertenly play "OtR" on the piano, I naturally gravitate it to E-flat for whatever reason. That just seems the logical place to have it, which is only one flat below the original key. An even lower key still seems like it should have been the original key when you put into mind the high notes. Judy Garland probably never thought others would mangle the song, though, when she had the final word on it for 68 years until Kat gave a new final word to it...
Katharine McPhee fans around the world