Yes, she can still sing. Her voice may have weakened throughout the years, but again, all voices will naturally weaken and change in range and strength. Check out her preformances at the Pre-Grammy awards in 2009 which proves she can still sing at a 2000/2001 level at least!
sing
Whitney Houston first started singing in a gospel choir at age 11
"The Star Bangled Banner"
whitney houston
luther van dross
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Whitney Houston first started singing in a gospel choir at age 11
Whitney Houston & Miriah Carey
She sang a medley of Whitney's songs as a tribute.
"The Star Bangled Banner"
"I'm Every Woman" by Whitney Houston :)
only for half of her life, then she started to sing for a living