I have lately noticed that there is some sort of glitch which causes you to sometimes not be able to hear a player's music, even if you are synced with them. However, exiting out of the game and coming back seems to fix it. If you find that others can't hear you, you might try that.
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[URL="https://lotromusic.wordpress.com/"][COLOR=#008080]LOTRO Music[/COLOR][/URL][COLOR=#ffd700]~[/COLOR] ABCs, guides and resources for the compleat LOTRO musician.