| A | So Serious | 2:38 |
| B1 | Matter Of Fact | 4:04 |
| B2 | Destination Unknown | 4:10 |
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| A 7090 | Electric Light Orchestra | So Serious (7", Single) | Epic | A 7090 | UK | 1986 |
| ZS4 05892 | Electric Light Orchestra | So Serious (7", Promo) | CBS Associated Records | ZS4 05892 | US | 1986 |
| 07SP 951 | Electric Light Orchestra | So Serious (7", Single, Promo) | CBS/Sony | 07SP 951 | Japan | 1986 |
| 07SP 951 | E.L.O.* | So・シリアス = So Serious (7", Single) | CBS/Sony | 07SP 951 | Japan | 1986 |
| A 7090, EPCA 7090 | Electric Light Orchestra | So Serious (7", Single) | Epic, Epic | A 7090, EPCA 7090 | Europe | 1986 |