Essential technologies for music streaming services include cloud computing, data compression, and content delivery networks (CDNs). Cloud computing facilitates the storage of vast music libraries, enabling users to access content from anywhere. Data compression techniques, such as MP3 and AAC, allow for efficient streaming without significant loss of audio quality. CDNs improve streaming performance by distributing content across multiple servers worldwide, reducing latency and buffering time. Together, these technologies create a seamless listening experience for users.