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Contemporary a cappella includes many vocal groups and bands who add vocal percussion or beatboxing to create a pop/rock/gospel sound, in some cases very similar to bands with instruments. Examples of such professional groups include Straight No Chaser, Pentatonix, The House Jacks, Rockapella, Mosaic, and M-pact. There also remains a strong a cappella presence within Christian music, as some denominations purposefully do not use instruments during worship. Examples of such groups are Take 6, Glad and Acappella. Arrangements of popular music for small a cappella ensembles typically include one voice singing the lead melody, one singing a rhythmic bass line, and the remaining voices contributing chordal or polyphonic accompaniment.
What has maintained a strong presence in all types of worship?
A: unanswerable

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The peaceful introduction of Islam in the early medieval era of Somalia's history brought Islamic architectural influences from Arabia and Persia. This had the effect of stimulating a shift in construction from drystone and other related materials to coral stone, sundried bricks, and the widespread use of limestone in Somali architecture. Many of the new architectural designs, such as mosques, were built on the ruins of older structures. This practice would continue over and over again throughout the following centuries.
Along with sundried bricks and coral stone, what construction material was widely used after the introduction of Islam?
A: limestone

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Renaissance humanism was an activity of cultural and educational reform engaged in by civic and ecclesiastical chancellors, book collectors, educators, and writers, who by the late fifteenth century began to be referred to as umanisti "humanists". It developed during the fourteenth and the beginning of the fifteenth centuries, and was a response to the challenge of scholastic university education, which was then dominated by Aristotelian philosophy and logic. Scholasticism focused on preparing men to be doctors, lawyers or professional theologians, and was taught from approved textbooks in logic, natural philosophy, medicine, law and theology. There were important centres of humanism at Florence, Naples, Rome, Venice, Mantua, Ferrara, and Urbino.
Where was one main concentration of Humanism?
A: Naples

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There are very few existing mosaics from the Komnenian period but this paucity must be due to accidents of survival and gives a misleading impression. The only surviving 12th-century mosaic work in Constantinople is a panel in Hagia Sophia depicting Emperor John II and Empress Eirene with the Theotokos (112234). The empress with her long braided hair and rosy cheeks is especially capturing. It must be a lifelike portrayal because Eirene was really a redhead as her original Hungarian name, Piroska shows. The adjacent portrait of Emperor Alexios I Komnenos on a pier (from 1122) is similarly personal. The imperial mausoleum of the Komnenos dynasty, the Pantokrator Monastery was certainly decorated with great mosaics but these were later destroyed. The lack of Komnenian mosaics outside the capital is even more apparent. There is only a "Communion of the Apostles" in the apse of the cathedral of Serres.
Why are there so few surviving mosaics from the Komnenian period?
A:
accidents of survival