Meant to post about this about a week ago but I was still working with adjusting to my move. But we have a more complete list of acts for the Ongaku no Hi that will air on TBS on June 29th and air from 2PM to 5AM. SMAP's Nakai Masahiro is down for one of the hosts of the program.
The Johnny's that have been announced for the program are SMAP, Yamashita Tomohisa, Kis-My-Ft2, Sexy Zone and A.B.C-Z.
Other idol groups that will be performing are AKB48, SKE48, NMB48, HKT48, 9nine, Nogizaka46, Momoiro Clover Z and Morning Musume.
You can look at the full list, which comes with photos for each act, at the official TBS site.
There is some speculation that Ebi and SZ may be getting placed under the Iijima Michi faction, with this line-up and the fact that they are the debuted groups regularly in the midnight Johnny's dramas (the late night NTV dramas). I am not sure if I buy into SZ being a part of this faction just yet, but I am more willing to believe it for Ebi. Ebi has been getting much better promotion recently than they have in their first year of being a debuted group and the fact that they are also appearing on another summer music program with the rest of the Michi faction though SZ is not also lends itself to backing that theory up.
Of course this is all just speculation as Johnny's is far from being a transparent agency but seeing the kinds of promotions those under Michi tend to get I think it would be great for Ebi to share in that. Especially if they get on variety programs, as I have felt that some of the members would shine so well on them.