The Austin-based experimental sextet known as The Young Mothers are releasing their second album this week, Morose .   Currently based in Austin, The Young Mothers tie together backgrounds as regionally varied as Texas, Chicago, New York, and Norway, engaging their multiple influences into a cross-genre synthesis of protest music and aural turbulence. As if to illustrate this perfectly, for the single "Black Tar Caviar," The Young Mothers compose a discordant, rhythmic tug of war that attempts to merge jazz-based improvisation with the bare-knuckle assault of hardcore or powerviolence.  Somewhat akin to the avant sonics and noise-fetish brass explorations of John Zorn , especially for its frenzy of a finale, "Black Tar Caviar" pairs confusion and aggression in a compelling way, pitting the avantgarde against the underground and reveling in the forms' rejection of each other.  Those opening Albert Ayler -styled sax notes almost seem like a red herri...