The 407's primary use will likely be male or female lead vocals due to its signature proximity effect. The original 47 had proximity effect behavior that was part of its sound and why it defined "big vocals". With up to +12dB of boost at 100Hz when used at 1 inch working distance, the 47 signature was "the sound" of many great artists such as Frank Sinatra. Led Zeppelin 1 used a 47 on nearly every vocal track. Tuesday Night Music Club and Cheryl Crowe was a classic application of a 47 for vocals. The key application was then and still is close worked vocals, male or female.
Tube 47's were never really flat even at distance (beyond 18inches) due to its signature head grille sound. Brass instruments were a favorite 47 application (the classic jazz signature of the most famous records from the 1950's) and small ensembles (ofnearly any instrumentation) saw the 47 as the "go to" mic. Cello and violin at short distance gain intimacy and acoustic or electricbass will find a perfect warm tone without muffling using the 407 Individual drums or drum kits will have astounding impactwith no overt artificial high end found when using some smalldiaphragm mics. Solo performers who sing while playing acousticguitars may be recorded with just this one microphone.