You also need to make sure your V5 is old enough (72 hours after evolving to adulthood I believe). And connect the two Tamas as many times as you can while selecting "others" on your Music Star and "Game" on the V5. When the friendship level is high enough (2 faces right up close to one another on V5 and 4 SMILING faces on the Music Star) select "Marry" then "Give" on the V5. On the Music Star, select "Others" as usual.
As OsuMesu21 stated in this thread,
Hope this helps! Please ask if this is still confusing!
okay. well I think that when V5 has enough age is when it would be able use the "Dating show"