Tibetan singingbowl

174 HZ standing 19×19" master tibetan healing bowl
The lowest recognized solfeggio frequency is 174 Hz, also known as the healing frequency. It has the greatest impact on the body and physical health, rather than spiritual or mental health. People mainly experience pain relief from this frequency, although it also reduces stress

The sound of Tibetan singing bowls and the gong harmonizes and allows deep relaxation of both sides of the brain. It stimulates stress relief on all levels and the elimination of toxins from the body.

Singing bowls have a frequency range anywhere between 110 Hz and 660 Hz but can reach up to the 800s or even 900s. Generally, Hz readings for singing bowls are approximate due to the complexity of their sounds and changing frequencies as they switch between different tones and octaves.
Singing can help improve mental alertness, memory and concentration as it involves focusing on multiple things at once, engaging many areas of the brain in the process.