I'm working on the piano solo version of Rhapsody in Blue, and I'm unsure - when there is an 8 underneath this E, is it meant to be played as just the lower E, or as a full octave (as in the measure before)?
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Purely as written, with no "con 8" or "col 8", the sheet music's 8 in the question indicates that the E should be played an octave below how it is written, and no E should be added below.
This reflects how Musescore (and likely Finale/Sibelius) would interpret that 8 "line" marking.
If the editor meant that to save space, and the piano solo version really does match the orchestral piano part version, then the editor mucked up and didn't notate the music correctly: it's that simple.