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Because it is one of the most versatile instruments, and many music study programs require knowledge of it.
comparative: more versatile superlative: most versatile
More versatile
Most versatile
Less versatile
Least versatile
"versatiler" and "verstilest" are not words in the English language, you have to use the modifiers of more, most, less and least.
because it is a versatile memory
The Versatile Benchtop Table Saw is the most versatile power tool