So therefore, it gives advantages of higher bitrate? But where can we find such "higher bitrate" songs? =P

The Idea behind CDR-Gold is lower ERROR bitrate, better longevity and more resistance to environmental exposure.

Your Optical drive does not need to work as hard on jitter error correction with Gold media. There is no effect on bit rate recording whatsoever. Frequency and bitrate are irrelevant to the physical medium, since the music is DIGITAL format.

CD-R GOLD media is naturally more resilient against environmental fluctuation and misuse, it has a reflective layer made with pure GOLD. CD-R GOLD dye is more rigid dye that is less forgiving to laser recording inaccuracies at higher speeds, it requires a very precise laser to burn perfect pits. It is more expensive and demanding to produce a stable Phthalocyanine GOLD CD-R media certified for high speed recording, in fact CD-R-GOLD media seems to have vanished from the market when CD recording speeds started to exceed 8x -12x.

Other, more commonly used, flexible organic dye media can compensate for a less precise laser at higher speed recording, and is also less expensive to produce. The down side of a more flexible dye is a shorter life span. By contrast once a GOLD Phthalocyanine dye is recorded, it is much harder to destroy and has by far a superior longevity. Mitsui Toatsu Chemicals of Japan (MAM) has patented the Phthalocyanine dye. Mitsui is perhaps the only company which continues to manufacture GOLD media, (and now Taiyo Yuden.) MITSUI CD-R GOLD media has a projected life span of 300 years. (Stored under the right environmental conditions)

There is no such thing as higher bitrate CD Disk.

Whether you have erroneous bits on the disk or not, the size of the bits is constant. Therefore the size of the song does not increase nor does it decrease. There is only 8 bits in a byte. If you have a 10 minutes song occupying one audio track on the CD AUDIO DISK with a size of 50 MB, this song is going to play back at 44Khz, irrespective of which CD audio player or computer Cd drive you insert it into, the "bitrate" has nothing to do with error correction. Whether the data is corrected via the DRIVE jitter correction ability or not, the same amount of "bits" is flowing out from that Drive. Example: 1+2+3=6 and 2 is not readable, the error correction mechanism would have to reverse calculate 6-(1+3)=2 and then process the 2 as if it was correct. the end result you hear the music as if it were intact, even though there were physical reading errors.

This is NOT the same as songs recorded in compression formats like MP3 and WMA, where you can assign a higher bitrate to achieve higher quality song for the same amount of play time. Which means more bits are allocated to the same amount of time at higher bitrate, and the file size will be larger of course. In other words if more bits represent the same amount of song time the cleaner and fuller the sound. This CAN NOT BE DONE IN CD DIGITAL AUDIO as the CDDA and WAV formats are FIXED.

New DVD-AUDIO DVD's are recorded at 48Khz higher frequency = better sound, perhaps larger size songs.

ALL THE ABOVE IS APPLICABLE to CD-AUDIO ONLY. Which is written in CDDA Format, the kind of CD-Audio Albums you by from your local Music Store.