Dear Gvasale,
A search on Google revealed the following quote from Wikipedia and nothing else about Sinatra ever having recorded Lush Life:
"On May 25, 1958, Sinatra unsuccessfully attempted to record Billy Strayhorn's ballad "Lush Life". A bootleg recording of Sinatra's attempt at "Lush life" exists; this was the only time Sinatra sang the song in his career."
In fact, it seems he might have been planning to include it on "Only the Lonely". Nor can I find that Sinatra recorded an album titled "Sentimental Reasons". However, he did record the song by the same name.
A search on Google revealed the following quote from Wikipedia and nothing else about Sinatra ever having recorded Lush Life:
"On May 25, 1958, Sinatra unsuccessfully attempted to record Billy Strayhorn's ballad "Lush Life". A bootleg recording of Sinatra's attempt at "Lush life" exists; this was the only time Sinatra sang the song in his career."
In fact, it seems he might have been planning to include it on "Only the Lonely". Nor can I find that Sinatra recorded an album titled "Sentimental Reasons". However, he did record the song by the same name.