This looks like a legitimate warning. The problem seems to be ampage.org, which (as Bob points out) is probably an advertiser. Here's the specific problem that FireFox reports to me:
Quote:

What happened when Google visited this site?

Of the 1198 pages we tested on the site over the past 90 days, 20 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2012-10-04, and the last time suspicious content was found on this site was on 2012-10-02.

Malicious software is hosted on 1 domain(s), including ampage.org/.

This site was hosted on 2 network(s) including AS13649 (VINS), AS15169 (Google Internet Backbone).


The link to ampage.org gives the following information:

Quote:

What happened when Google visited this site?

Of the 170 pages we tested on the site over the past 90 days, 40 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2012-10-04, and the last time suspicious content was found on this site was on 2012-10-03.

Malicious software includes 71 trojan(s).

Malicious software is hosted on 2 domain(s), including lqlonqihgkco.kwik.to/, ocpvdul.sendsmtp.com/.

This site was hosted on 2 network(s) including AS29933 (OFF), AS15169 (Google Internet Backbone).

Has this site acted as an intermediary resulting in further distribution of malware?

Over the past 90 days, ampage.org did not appear to function as an intermediary for the infection of any sites.

Has this site hosted malware?

Yes, this site has hosted malicious software over the past 90 days. It infected 12 domain(s), including mylespaul.com/, talkbass.com/, music-electronics-forum.com/.


So this problem isn't unique to Harmony Central.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?