diff --git a/audio/internal/convert/seeker.go b/audio/internal/convert/seeker.go
deleted file mode 100644
index 5583c52cc..000000000
--- a/audio/internal/convert/seeker.go
+++ /dev/null
@@ -1,76 +0,0 @@
-// Copyright 2017 The Ebiten Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package convert
-
-import (
-	"io"
-
-	"github.com/hajimehoshi/ebiten/audio"
-)
-
-// A Seeker is io.Seeker and io.ReadSeekCloser.
-type Seeker struct {
-	rc   io.ReadCloser
-	data []uint8
-	pos  int64
-	eof  bool
-}
-
-// Read is implementation of io.Reader's Read.
-func (s *Seeker) Read(buf []byte) (int, error) {
-	for int64(len(s.data)) <= s.pos && !s.eof {
-		buf := make([]uint8, 4096)
-		n, err := s.rc.Read(buf)
-		s.data = append(s.data, buf[:n]...)
-		if err != nil {
-			if err == io.EOF {
-				s.eof = true
-				break
-			}
-			return 0, err
-		}
-	}
-	if int64(len(s.data)) <= s.pos && s.eof {
-		return 0, io.EOF
-	}
-	n := copy(buf, s.data[s.pos:])
-	s.pos += int64(n)
-	return n, nil
-}
-
-// Seek is implementation of io.Seeker's Seek.
-func (s *Seeker) Seek(offset int64, whence int) (int64, error) {
-	switch whence {
-	case io.SeekStart:
-		s.pos = offset
-	case io.SeekCurrent:
-		s.pos += offset
-	case io.SeekEnd:
-		panic("not implemented")
-	}
-	return s.pos, nil
-}
-
-// Read is implementation of io.Closer's Close.
-func (s *Seeker) Close() error {
-	return s.rc.Close()
-}
-
-// NewSeeker creates audio.ReadSeekCloser from io.ReadSeeker.
-func NewSeeker(rc io.ReadCloser) audio.ReadSeekCloser {
-	return &Seeker{
-		rc: rc,
-	}
-}
diff --git a/audio/mp3/decode_notjs.go b/audio/mp3/decode_notjs.go
index 7ef4e7c59..d23a0cf71 100644
--- a/audio/mp3/decode_notjs.go
+++ b/audio/mp3/decode_notjs.go
@@ -55,7 +55,7 @@ func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
 		return nil, err
 	}
 	// TODO: Resampling
-	var s audio.ReadSeekCloser = convert.NewSeeker(d)
+	var s audio.ReadSeekCloser = d
 	size := d.Length()
 	if d.SampleRate() != context.SampleRate() {
 		s = convert.NewResampling(s, d.Length(), d.SampleRate(), context.SampleRate())
diff --git a/examples/audio/main.go b/examples/audio/main.go
index 554ad8e73..8250465dd 100644
--- a/examples/audio/main.go
+++ b/examples/audio/main.go
@@ -34,7 +34,7 @@ const (
 	screenWidth  = 320
 	screenHeight = 240
 
-	// This sample rate doesn't match with wav/ogg's sample rate,
+	// This sample rate doesn't match with wav/mp3's sample rate,
 	// but decoders adjust them.
 	sampleRate = 48000
 )