A Tap-root is the main root of a vegitative organism, e.g. a tree. It is the typically the largest, strongest root from which sub-roots and root fibres grow. Its purpose is to feed the organism and secure it to its stead.
Taproot are, IMO a post-grunge / nu-wave / hardcore band with whose styles may be considered synonymous with those of Pearl Jam, Silverchair and Hundred Reasons.
"THIS *is* an anagram of "SHIT", Taproot however has no relationship to the word. Each to their own, as they say.