vgmrips

Title	Wonder Boy in Monster Land
Composer	Shinichi Sakamoto
System	Sega System 2
Sound Chips	2xSN76489A
Tracks	20
Playing time	19:35
Pack author	Sonic of 8!
Pack version	1.10
Last Update	2013-05-28

Pack author's comment
Wonder Boy Arcade VGM Rips was done! And all of them was made by me!

I may recommend to users grabbing all of the unsubmitted VGM Packs, because SOPA & PIPA can shutdown Mediafire that is located in State of Texas (SOPA & PIPA was turned off Megaupload and put his founder on jail)... Or maybe not.

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オモいカルチャーをオモチャーと言う - 細野晴臣

Those bills would need to pass first...

Oh man, I love this game. Maybe a bit too hard, but it's awesome.

Me, now:

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Also known as nineko.

It seems like this soundtrack cannot be emulated properly. Some parts cannot be heard and other plays one octave below the original.

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Hyper Fanboy

I already wondered when the first complaint about that comes...

It's because the Sega System 1/2 uses 2 PSGs with 2 different clocks (2 MHz and 4 MHz) and that isn't supported by VGM v1.51. (dual chips always have the same clock speed)
But as you can hear when playing the demo VGM included with VGMPlay, v1.70 will fix that problem, so it's just a matter of time.

EDIT: With the 2013-05-28 update, I updated the files to VGM v1.70 and fixed the issue.

Wouldn't hurt to use "Wonder Boy: Monster Land" instead. This version didn't have the "in" at any point, which also happens to match up with the Japanese port and Monster Lair.