/* Seventh plus altered 9 */
{ {{1, 0}, {9, +1}, {3, 0}, {5, 0}, {7, -1}}, "7♯9" },
{ {{1, 0}, {9, -1}, {3, 0}, {5, 0}, {7, -1}}, "7♭9" },
/* Seventh plus altered 9 */
{ {{1, 0}, {9, +1}, {3, 0}, {5, 0}, {7, -1}}, "7♯9" },
{ {{1, 0}, {9, -1}, {3, 0}, {5, 0}, {7, -1}}, "7♭9" },