Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Summertime (Brian Melo song)
Table title:
Release history
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Country </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Label </th><th colspan=1 rowspan=1 > Format </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > Australia </td><td class="highlighted"  colspan=1 rowspan=1 > August 23, 2008 </td><td colspan=1 rowspan=2 > Sony BMG </td><td class="highlighted"  colspan=1 rowspan=1 > Digital download </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > September 13, 2008 </td><td class="highlighted"  colspan=1 rowspan=1 > CD single </td></tr>
</table>
Question:
Which formats did Brian Melo release Summertime firstly on 23 August 2008 and then which format was released on 13 September 2008 in Australia?
Answer:
Summertime (Brian Melo song) was released as a digital download on August 23, 2008, and as a CD single on September 13, 2008, in Australia.