Elvis recorded "I Forgot To Remember To Forget" July 11 1955 at Sun Records with Scotty Moore and Bill Black and Johnny Bernero on drums. It reached #1 for 5 weeks on Billboard's Country Juke Box chart and #1 for 2 weeks on the Country Best-Seller chart, remaining on the chart for 39 weeks, the longest of any Elvis single release on any Billboard chart. It was the B-side to Mystery Train. Elvis frequently sang this song on the Louisiana Hayride.

The song reached the Billboard national country music chart #1 position on February 25, 1956 on the Billboard C&W Best Sellers in Stores chart, and remained there at #1 for 2 weeks, and spent 5 weeks at #1 on the Billboard C&W Most Played in Juke Boxes chart. The record reached #4 on the Billboard Most Played by Jockeys chart. It was the first recording to make Elvis Presley a national known country music star. The song remained on the country charts for 39 weeks.
~Source Wikipedia