Exhibit 99.1

Canadian Satellite Radio Announces Pricing of Senior Notes Offering

TORONTO, March 31 /CNW/ - Canadian Satellite Radio Holdings Inc. ("CSR" or the "Company") (TSX: XSR) today announced it has priced its offering for its 9.75% Senior Notes due 2018 (the "Notes") at a price of 100% (the "Offering") and the Company has accepted subscriptions for $62 million aggregate principal amount of Notes in the Offering.

On November 24th, 2010, the Company and Sirius Canada Inc. entered into a securities purchase agreement to combine the companies in an all-stock merger of equals (the "Merger"). The Offering was undertaken as part of a larger refinancing of certain debt of the Company in connection with the Merger which is expected to result in the issuance of approximately $130 million aggregate principal amount of notes. Concurrently with the Offering, the Company is conducting an exchange offer and consent solicitation (the "Exchange Offer") for its 12.75% Senior Notes due 2014 (the "Existing Notes"). As of the date hereof, US$68.83 million aggregate principal amount of Existing Notes have been tendered in the Exchange Offer.

National Bank Financial Inc. acting as sole book-running manager, with Canaccord Genuity Corp. as co-lead manager, led a group of agents in connection with the Offering. Subject to the satisfaction of certain closing conditions, including receipt of CRTC approval of the Merger, the Offering is expected to close in May 2011 or June 2011, on the same date as the closing of the Merger.

The Notes will bear interest at the rate of 9.75% per annum payable semi-annually commencing on the date that is six months following the closing of the Offering. The Notes will be senior unsecured obligations of the Company and as such, will be equal in right of payment with all existing and any future unsecured senior indebtedness and senior in right of payment to any future subordinated indebtedness. Net proceeds from the Offering will be used to fund the cash payments under the Exchange Offer, repay outstanding indebtedness and for general corporate purposes.

The Notes have not been, and will not be, qualified for distribution to the public under the securities laws of any province or territory of Canada or registered under the United States Securities Act of 1933.

This press release does not constitute an offer to purchase or sell any securities. Any offer to purchase or sell securities will be made by means of an offering memorandum. No offer, solicitation, purchase or sale will be made in any jurisdiction in which such an offer, solicitation, purchase or sale would be unlawful.

Forward Looking Statements

Certain statements included above may be forward-looking in nature. Such statements can be identified by the use of forward-looking terminology such as "expects," "may," "will," "should," "intend," "plan," or "anticipates" or the negative thereof or comparable terminology, or by discussions of strategy. Forward-looking statements include estimates, plans, expectations, opinions, forecasts, projections, targets, guidance or other statements that are not statements of fact. Although CSR believes that the expectations reflected in such forward-looking statements are reasonable, it can give no assurance that such expectations will prove to have been correct. CSR's forward-looking statements are expressly qualified in their entirety by this cautionary statement. Forward-looking information is provided as of the date of this news release only, it should not be relied upon as of any other date, and CSR assumes no obligation to update or revise this information to reflect new events or circumstances, except as expressly required by law. There can be no assurance that the securities purchase agreement will receive all necessary approvals or that the Merger or Offering will be completed. Additional information, including a thorough discussion of the risk factors that can cause anticipated outcomes to differ from actual outcomes, will be contained in CSR's filings with the Canadian securities regulators, available at www.sedar.com.

About Canadian Satellite Radio Holdings Inc.

To find out more about Canadian Satellite Radio Holdings Inc. (TSX: XSR), visit www.xmradio.ca.

About SIRIUS Canada

To find out more about SIRIUS visit www.sirius.ca.

%CIK: 0001354901

For further information:

Investor Relations

Morlan Reddock

416-408-6899

investor.relations@xmradio.ca

CO: XM Canada

CNW 19:01e 31-MAR-11

Canadian Satellite Radio Holdings Inc. 6-K