Apple has posted a support document, outlining the availability of Apple Music features internationally. Noted by iPhone in Canada, the document has 4 categories: Apple Music, Beats 1, Apple Music Radio and iTunes Match and shows which countries have access to which features.
Based on the support document, Apple Music and Apple Music Radio is available to 110 countries worldwide. With the exception of Angola, Puerto Rico, Israel, Taiwan and Turkey, where the music streaming service has yet to launch.
Beats 1, the 24/7 online radio station, is available in 100 countries with the exception of Bahamas, Bahrain, Burkina-Faso, Egypt, Hungary, Israel, Jordan, Lebanon, Mozambique, Namibia, Oman, Qatar, Russia, Saudi Arabia, Singapore, Taiwan, Turkey and United Arab Emirates.
Lastly, iTunes Match is available in all listed countries except for Romania.