What does SLS stand for?

Speech Level Singing (vocal training)

This definition appears very rarely and is found in the following Acronym Finder categories:

Organizations, NGOs, schools, universities, etc.
Business, finance, etc.

Other Resources:

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Sodium Lauryl Sulfate (foaming ingredient) Softlanding Linux System Sonobuoy Localization System Space Launch Squadron Space Life Sciences Lab (NASA; formerly Space Experiment Research and Processing Laboratory Spacelab Life Sciences Spam Lookup Service Special Liquidity Scheme (Bank of England) Specialist in Laboratory Safety Speech and Language Sciences		Spoken Language System Sport and Leisure Studies (various schools) SprintLink Services Squadron Leadership School Sri Lanka Solidarity (Association) SSD Lazy Simulator Stabilized Light Source (Bellcore - Fiberoptics) Standard Level of Service Standard Link State Stanford Law School

Samples in periodicals archive:

For you to learn to sing high notes, you should practice speech level singing exercises.

Learn How to Sing High Notes without Straining

Each complete vocal program in American Idol Singer's Advantage includes a 56-page customized workbook; an Introduction To Speech Level Singing DVD; and seven CDs including a Voice Evaluation CD, four Customized Lesson Plans CDs, a Sound Choice Songs CD, and a 5 Secrets To Mastering Any Song CD.

American idol singing course: Music Sales