UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

For the quarterly period ended June 30, 2012

For the transition period from          to         

1-35438

(Commission File Number)

MAKEMUSIC, INC.

(Exact name of registrant as specified in its charter)

7615 Golden Triangle Drive, Suite M

Eden Prairie, Minnesota 55344-3848

(Address of principal executive offices)

(952) 937-9611

(Registrant’s telephone number, including area code)

Not applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: As of July 30, 2012 there were 4,898,707 shares of Common Stock outstanding.

EXPLANATORY NOTE

MakeMusic, Inc. (the “Company”) is filing this Amendment No. 1 (“Amendment No. 1”) to the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2012 (the “Initial Quarterly Report”) solely to furnish Exhibit 101 XBRL interactive date files within the grace period provided by Rule 405(a)(2) of Regulation S-T applicable for the first quarterly period in which detailed footnote tagging is required.

The only changes to the information provided in the Initial Quarterly Report that are made by this Amendment No. 1 are the furnishing of Exhibit 101 and the revision of Item 6 to refer to Exhibit 101. This Amendment No. 1 does not reflect events occurring after the date on which the Initial Quarterly Report was filed with the Securities and Exchange Commission.

Pursuant to Rule 406T of Regulation S-T, the Interactive Data Files furnished as Exhibit 101 to this Amendment No. 1 will not be deemed “filed” for the purposes of Section 18 of the Securities and Exchange Act of 1934 or otherwise subject to the liability of that section, nor will they be deemed filed or made a part of a registration statement or prospectus for purposes of Sections 11 and 12 of the Securities Act of 1933, or otherwise subject to liability under those sections.

PART II. OTHER INFORMATION

See the attached exhibit index.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

EXHIBIT INDEX

Form 10-Q/A

for the quarterly period ended June 30, 2012