"All computers preform disk utilization the same software "
This is false .
Answer:
Mobile Internet is dependant on cellular signal. Many countries, e.g. in Africa, don't have any coverage at all. Furthermore, mobile data might also not be available in the mountains as there are no cell towers and the rough terrain usually either blocks the signal entirely or weakens it significantly.
Key signatures were used because simply by knowing how many sharps or flats there were, the tuning would be more uniform. Tuning systems were not developed yet during the Baroque era and the concept of key was not introduced by then.
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