What you are training
A siren is a slow slide from the bottom of the voice to the top and back, on an "ng" or an "oo", with no steps and no stopping. It is the gentlest way to work the passaggio, the place where the voice shifts from chest to head, because a slide gives the muscles time to hand over instead of forcing a jump. Singers who siren daily lose the crack; singers who avoid the break keep it. The exercise is also diagnostic: the pitch where the slide wobbles or thins is your transition, and knowing it makes every song easier to plan. This exercise plays a reference siren and follows yours, tracking the smoothness of the slide rather than the pitch of any one note. Keep it quiet, keep it connected, and let it be ugly at first.
How to do it
- Choose an easy "oo" or lip trill, then start on a low comfortable note.
- Slide up to a high comfortable note and back down in one continuous arc.
- Keep the top lighter and quieter than the bottom. Do not hold or belt the high note.
- Do 4-6 smooth sirens, expanding only while the slide stays easy.
- Stop if the voice cracks hard, the throat grabs, or you need extra volume to reach the top.
Sirens connect low, middle, and high voice without making you aim at fixed notes. The goal is a smooth register bridge and a quick read on where your voice is comfortable today.
After this exercise, the plan: The daily plan builds from sirens to mixed-voice work at the exact pitches where your slide showed the handover.
If singing hurts, stop. Pain, hoarseness, extra effort, loss of range, or repeated throat clearing that lasts more than a day is a reason to see an ENT or laryngologist, or a speech-language pathologist who specializes in voice. It is not a reason to practice harder.