Index: src/wp-admin/includes/media.php
===================================================================
--- src/wp-admin/includes/media.php	(revision 26062)
+++ src/wp-admin/includes/media.php	(working copy)
@@ -223,6 +223,7 @@
 	$file = $file['file'];
 	$title = $name;
 	$content = '';
+	$excerpt = '';
 
 	if ( preg_match( '#^audio#', $type ) ) {
 		$meta = wp_read_audio_metadata( $file );
@@ -230,8 +231,6 @@
 		if ( ! empty( $meta['title'] ) )
 			$title = $meta['title'];
 
-		$content = '';
-
 		if ( ! empty( $title ) ) {
 
 			if ( ! empty( $meta['album'] ) && ! empty( $meta['artist'] ) ) {
@@ -281,7 +280,7 @@
 		if ( trim( $image_meta['title'] ) && ! is_numeric( sanitize_title( $image_meta['title'] ) ) )
 			$title = $image_meta['title'];
 		if ( trim( $image_meta['caption'] ) )
-			$content = $image_meta['caption'];
+			$excerpt = $image_meta['caption'];
 	}
 
 	// Construct the attachment array
@@ -291,6 +290,7 @@
 		'post_parent' => $post_id,
 		'post_title' => $title,
 		'post_content' => $content,
+		'post_excerpt' => $excerpt,
 	), $post_data );
 
 	// This should never be set as it would then overwrite an existing attachment.