UPDATE 1-Sony shares rise after Sony BMG deal

(Adds analyst comments, latest share price, background)

TOKYO, Aug 6 (Reuters) - Shares in Sony Corp (6758.T) traded higher on Wednesday after the electronics maker said on Tuesday it had agreed to buy Bertelsmann's [BERT.UL] 50 percent stake in their Sony BMG music joint venture for around $900 million.

The music company -- the world's second-largest after Vivendi (VIV.PA) unit Universal -- will now be called Sony Music Entertainment Inc (SMEI) and become a wholly owned subsidiary of Sony Corporation of America, subject to regulatory approval.

"Even if it becomes a consolidated subsidiary, Sony BMG would make a negligible contribution to (this year's) operating profits as it has current-year restructuring costs of $140 million," Goldman Sachs said in a note to clients.

"But we see considerable medium-term profit growth potential."

Goldman Sachs maintained its "buy" rating on Sony following the announcement.

Some analysts, however, questioned Sony's move, pointing to declining sales of packaged music.

In 2007, global recorded music sales took an 8 percent dive to $19.4 billion, according to music industry body IFPI, as CDs were overtaken by digital forms of music distribution.

After opening at 4,200 yen, Sony shares traded up 3.7 percent at 4,210 yen by midmorning, outperforming the Tokyo stock market's electrical machinery index .IELEC.T, which gained 2.7 percent.

Recording artists at SMEI will include Celine Dion, Alicia Keys, Bruce Springsteen, Justin Timberlake, Usher and Jay Chou. (Reporting by Kiyoshi Takenaka; Editing by Michael Watson)