Edit: I downloaded the file and the bgm is glitchy, it would have these random pauses.
Edit 2: Some of the files if downloaded works perfectly.
Edit 3: It doesnt work for chrome it works for firefox tho.
All worked for me. If it's not working for you, probably don't have the player to run ogg. Since most can run mp4, you can download MapleStory BGMs [url=https://onedrive.live.com/?cid=8de1c7f713aafc75&id=8DE1C7F713AAFC75!129]here[/url], which is provided by SlipySlidy