Q: When can you use the FMaj7#11 chord?
A: it seems to me that that chord symbol is asking you to have E and B notes, while F is also in the bass. for some reason, in my world that never seems to want to occur. nor in any of the worlds that intersect with mine. it seems to me that if you have B note in a chord with F in the bass, you are much more likely to want G note in there, maybe even C also. maybe D. but not B and E at the same time with F in the bass. for some reason that almost never occurs for me nor in any of the music i ever hear. that chord symbol does however seem to come up time and time again amongst people who are studying music academically