ANSWER: Long ago Romans used to use Tufa to construct their buildings. This was a long time before concrete came into use. Tufa never went outdated but Travertine was started to be used because of its long durability. Travertine is a form of limestone deposited by mineral springs. It often has a fibrous or concentric appearance and exists in white, tan, cream-colored, and even rusty varieties.
Definition of Triad Chord: A triad is a three-note chord consisting of a root note, a third, and a fifth. Besides two-note "intervals," which are simply two notes played at once, triad chords are the simplest and smallest chords. More complex chords are built on top of the triad.
