Therefore, the song should be modified for different learners, such as the visually, physically, and hearing challenged learners. Is this sentence grammatically correct?

The sentence is not grammatically correct. A better construction would be;

Therefore, the song should be modified for different learners, such as the visually, physically, and hearing-impaired learners.

Explanation:

For a sentence to be seen as grammatically correct, there must be subject-verb agreement, correct use of punctuations, and proper usage of qualifiers. In the sentence above, there is a subject-verb agreement.

A problem with grammar can be seen in the use of the phrase, "hearing challenged". A better usage should be hearing-impaired. The hyphen was omitted. Impaired is also a better adjective for those with hearing problems.

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.