American music genre popular in early 20 th century

How to build a cardboard bridge busing no tape or glue only cardboard and only be allowed to cut the cardboard and it has to be a beam bridge?

Which of the following is not typical of medieval music? monophonic or polyphonic often not written down religious in nature mainly instrumental

Which of the following is not a characteristic of bebop? reharmonization and chord substitution common emphasis on improvised solos new repertoire created from jazz standards using new melodies general attitude of restraint, tranquility