Originally Posted By: soulagent
I am trying to do an arrangement of Jailhouse Rock by Elvis Presley.

Listen to the intro.

12 123 D#,E then 2 snare beats . Repeated.

The D# is the 4th count of the count in and the Ist beat of bar 1.

regards

With respect, I think you may be interpreting the count-in incorrectly.
The very first note of the intro to Jailhouse Rock is on beat 4, not beat 1.
The D# is beat 4. The E is the first beat of the next bar.
This is my interpretation of how I hear the count in:

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